Here you’ll find our most frequently asked questions.

If you’ve got a question that you’d like answering – please, get in contact with us and we’ll be glad to answer! We might even add your question to this page to help others too!

Q
My Moon Jellyfish Has A Hole Or Tear In Its Bell, What Should I Do?

Moon Jellyfish can form holes or tears in their bell if something is wrong with their living or feeding conditions.

A hole can be the start of the jellyfish losing tissue, normally as a result of poor water quality. However, Moon Jellyfish can recover from this sort of damage if treated correctly!

Advice depends on your own tank’s situation, so best bet is to get in contact with us where we’ll be glad to provide assistance.

A few simple steps can be followed to ensure there is potential for recovery –

  • Ensure water is free of any food debris, the water should be as ‘clean’ as possible!
  • Ensure the jellyfish is taking on food properly – are the ‘stomachs’ appearing full after having taken on food?
  • Use a saltwater test kit to check your water’s parameters – is anything looking bad? If yes, consider a 10% water change. Test daily, and repeat 10% water change daily if necessary.
Q
Can Red Cross Blubber Jellyfish Be Kept With Other Jellyfish Species?

Yes! Red Cross Blubber Jellyfish can be kept in harmony with their cousins, the Blue Blubber Jellyfish.

Q
Are Red Cross Blubber Jellyfish Harmful To Humans?

No, Red Cross Blubber Jellyfish do not have a sting, and so make great first-time jellyfish pets!

Q
How Long Do Red Cross Blubber Jellyfish Live?

Red Cross Blubber Jellyfish can live for up to and over 1 Year in our jellyfish tanks!

Q
What Do Red Cross Blubber Jellyfish Eat?

Our own Jellyfish Food is perfect for Red Cross Blubber Jellyfish, providing them with all of the nutrients they require for a healthy diet.

They should be fed up to twice per day.

Q
What Water Temperature Is Suitable For Red Cross Blubber Jellyfish?

Water temperature of between 26°C and 28°C is recommended as an ideal temperature for keeping of Red Cross Blubber Jellyfish.

 

Q
Do you Deliver to the US?

Yes!

We are able to deliver most of our products to US customers, including some jellyfish species.

Jellyfish Species available to US customers: Moon Jellyfish only.

If looking to place an order to the US, contact us with your requirements and a delivery address, and we’ll return to you with a delivery quote.

Q
How Much Water Do I Need For My Tank?

For a Jellyfish Art Cylinder Nano, you will require a minimum of 8 litres of Salted RO Water. We’d recommend 10-15 litres, as this will provide you with additional water to cater for your first few weekly 2-litre water changes.

For an Orbit 20 Desktop Jellyfish Tank, you will require a minimum of 20 litres of Salted RO Water. 25 litres is recommended as this will provide you with extra water for your first couple of weekly water changes.

For a Pulse 80 Jellyfish Tank, you will require 80 litres of Salted RO Water.

For a Pulse 160 Jellyfish Tank, you will require 150 litres of Salted RO Water.

Q
How Long Do Atlantic Sea Nettles Live?

Atlantic Sea Nettle Jellyfish typically live for 1 year in captivity, but with perfect care and proper water maintenance, this can be extended up to around 2 years.

Q
What Do Atlantic Sea Nettles Eat?

Atlantic Sea Nettles need to be fed on freshly-hatched baby brine shrimp, or adult brine shrimp.

Q
Are Atlantic Sea Nettles Harmful To Humans?

Yes, Atlantic Sea Nettles have a sting which feels like stinging nettles, and therefore should never be touched.

If you ever need to put your hand into a tank with Atlantic Sea Nettles, then we recommend to wear latex gloves in case.

Q
Can Atlantic Sea Nettles Be Kept With Other Jellyfish Types?

No, unfortunately not! Atlantic Sea Nettles must not be kept with other jellyfish species.

Q
What Water Temperature Is Suitable For Amakusa Jellyfish?

We recommend a water temperature of between 20 and 26°C for jellyfish tanks with Amakusa jellyfish.

There is no need to use a water heater with any of our jellyfish tanks.

Q
How Long Do Amakusa Jellyfish Live?

Amakusa Jellyfish can live for up to 1 Year in our jellyfish tanks.

Q
Why Are My Moon Jellyfish Shrinking?

Moon jellyfish are fairly unique in that their size depends on the amount of food they eat.

If your Moon jellyfish are shrinking, this means they are not being fed enough, or perhaps they were being fed too much previously and are now adapting to the lower feeding amounts.

A shrinking jellyfish is always due to a jellyfish not feeding adequately; however this can also be due to water quality.

If pH is too high, a jellyfish can reject food, and therefore result in shrinking. Check your water parameters, and consider making a 10% water change to bring your water quality back in line.

Q
How Long Do Flame Jellyfish Live?

Flame Jellyfish can live for up to and over 12 Months in any of our jellyfish tanks.

Q
How Long Should My Tank Be Running Before Adding Jellyfish?

The answer to this question always varies.

Jellyfish tanks need to go through a “cycle” process of their water, before jellyfish can be added. This ensures that the water in your tank is adequate for providing a safe home for your jellies. So it’s an important process to pay attention to! Skipping or rushing this process will only result in a super-short lifespan of your jellyfish!

Information on how to adequately cycle your jellyfish tank can be found on our Help and Advice pages.

Typically this process takes 10-14 days, but the timescale always varies depending on which cycle method you choose.

Q
Can I Use Tap Water In My Jellyfish Tank?

No way!

Jellyfish tanks require Salted RO water with an SG of 1025 – which works out to 38g salt per 1 litre of RO water.

You can mix this yourself, or you can buy this pre-mixed from almost any aquatic shop – it is relatively cheap, usually about £5 for 25 litres.

Q
What Water Temperature Is Suitable For Ghost Jellyfish?

We recommend a water temperature of between 20 and 26°C.

Note that our jellyfish tanks do not require chillers or heaters.

Q
What Do Ghost Jellyfish Eat?

Ghost Jellyfish will eat Baby Brine Shrimp – our Cubic Medusa Jellyfish food is a perfectly suitable replacement, providing all of the nutrients they require.

They should be fed 1-2 times per day.

Q
How Long Do Ghost Jellyfish Live?

Ghost Jellyfish can live for up to 1 Year in our jellyfish tanks.

Q
Are Ghost Jellyfish Harmful To Humans?

Yes, Ghost Jellyfish have a sting which can cause skin irritation. It is for this reason that we recommend Ghost jellies are only kept by experienced jellyfish owners – if it’s your first time keeping jellyfish, Ghost jellyfish are probably not for you!

Q
Can Ghost Jellyfish Be Kept With Other Jellyfish Types?

No, Ghost Jellyfish must be kept in an aquarium with only their own species – they must not be mixed with other jellyfish species.

Q
What Temperature Should My Jellyfish Tank Be?

For all of the species we currently supply (Moon, Blubber, Flame, Amakusa, Spotted Lagoon), running your jellyfish tank at room temperature is absolutely fine – in other words, no heater or chiller is required.

Temperatures of between 18°C and 25°C are advised. You should therefore only need a heater or chiller if water temperature is above or below this range.

Q
What pH Should The Water In My Jellyfish Tank Be?

Water quality is essential for your jellyfish’s well being.

A pH level of between 7.9 and 8.4 is necessary.

Q
What Salinity Should My Jellyfish Tank’s Water Be?

Although some jellyfish can withstand a wide range of salinity levels, we recommend Water Salinity of 34-35ppt, which ensures a level close to that of natural seawater.

Q
How Often Should I Change My Jellyfish Tank’s Water?

We recommend a weekly 10-20% water change in order to maintain high levels of water quality.

For a Jellyfish Art Cylinder Nano tank, we recommend a 2 litre water change weekly, along with a top-up with a cap-ful of JellyBio Maintain.

Q
What Do Moon Jellyfish Eat?

Our Cubic Medusa Jellyfish Food is suitable, or you can feed them with Live (enriched) or Frozen Baby Brine Shrimp – Up to twice a day.

Q
What Water Temperature Is Suitable For Moon Jellyfish?

Typically room temperature is absolutely fine for Moon Jellyfish – however to be specific, temperatures of 18°C to 24°C will be suitable.

There is no need to use a chiller in any of our jellyfish tanks.

Q
How Long Do Moon Jellyfish Live?

Moon Jellyfish can live for over a year in our jellyfish tanks.

They live for roughly a year in the wild – but can live for longer than this in captivity, if water quality and feeding is well maintained.

Q
Are Moon Jellyfish Harmful To Humans?

No, Moon Jellyfish do not have a sting and are therefore very much suitable as first time jellyfish pets.

Q
What Do Blue Blubber Jellyfish Eat?

Our Cubic Medusa Jellyfish Food is suitable, or you can feed them with Live (enriched) or Frozen Baby Brine Shrimp – Up to twice a day.

Q
Do Your Tanks Come With Any Warranty?

Yes, all of our aquariums come with a 12 Month hassle-free warranty.

Breakages are rare with our tanks due to their high build quality, but in the rare event of any parts failure, we will send you replacement parts free of charge.

Q
What Water Temperature Is Suitable For Blue Blubber Jellyfish?

Water temperatures of 24°C to 28°C are recommended as ideal for the keeping of Blue Blubber Jellyfish.

There is no need for the use of a heater in any of our jellyfish tanks.

Q
How Long Do Blue Blubber Jellyfish Live?

Blue Blubber Jellyfish typically live for up to and over 12 Months in our jellyfish tanks.

Q
Are Blue Blubber Jellyfish Harmful To Humans?

No, Blue Blubber Jellyfish do not have a sting and are therefore very much suitable as first time jellyfish pets.

Q
Are Blue Blubber Jellyfish Actually Blue?

Despite the name, Blue Blubber Jellyfish are actually not always blue! They come in a variety of colours, which is a big part of their popularity.

As well as blue, they also come in white, brown, purple, burgundy, light blue and dark purple.

We try to give customers a range of colours when purchasing Blue Blubbers, to keep things interesting!

Q
Can Blue Blubber Jellyfish Be Kept With Other Jellyfish Types?

Yes! Blue Blubber Jellyfish can live in harmony with Red Cross Blubber Jellyfish in the same tank.

Q
Can Moon Jellyfish Be Kept With Other Jellyfish Types?

Unfortunately not. Moon Jellyfish should only be kept with other Moon jellies.

Q
What Water Temperature Is Suitable For Spotted Lagoon Jellyfish?

Water temperature of between 20°C and 24°C is recommended for your Spotted Lagoon Jellyfish.

There is no need to use a water heater with any of our jellyfish tanks.

Q
Why Do Spotted Lagoon Jellyfish Need Full Spectrum Lighting?

Spotted Lagoon Jellyfish rely on the photosynthesis of symbiotic algae in order to gain energy – without Full Spectrum Lighting, this photosynthesis would not occur.

This means that if you keep Spotted Lagoons, your tank’s lights should be kept on a rotation between colours.

Q
What Do Spotted Lagoon Jellyfish Eat?

Our Cubic Medusa Jellyfish Food is suitable, or you can feed them with Live (enriched) or Frozen Baby Brine Shrimp – Up to twice a day.

Q
How Long Do Spotted Lagoon Jellyfish Live?

Spotted Lagoons are actually some of the longest-living jellyfish species that we supply – they have been known to live for up to 14 months in captivity!

Q
Are Spotted Lagoon Jellyfish Harmful To Humans?

No, Spotted Lagoon Jellyfish do not have a sting and are therefore very much suitable as first time jellyfish pets.

Q
Can Spotted Lagoon Jellyfish Be Kept With Other Jellyfish Types?

No, unfortunately not. Spotted Lagoons must not be mixed with other jellyfish species.

Q
What Do Amakusa Jellyfish Eat?

Amakusa require a lot of meaty food – frozen chopped squid or mussels are ideal.

They will wrap around the food with their tentacles and pull it towards them for feeding.

In the wild, Amakusa Jellyfish will feed on fish and jellyfish up to 2-3 times their size, so they are difficult to over-feed.

We recommend to alternate between food types – one day using our Dried Medusa Jellyfish Food, next day using chopped frozen meat such as squid or mussels.

Q
Are Amakusa Jellyfish Harmful To Humans?

Yes, Amakusa Jellyfish have a sting and therefore should never be touched.

If you ever need to put your hand into a tank with Amakusa Jellyfish, we recommend to wear latex gloves just in case.

Q
What Do Flame Jellyfish Eat?

Our Cubic Medusa Jellyfish Food is suitable, or you can feed them with Live (enriched) or Frozen Baby Brine Shrimp – Up to twice a day.

Q
Are Flame Jellyfish Harmful To Humans?

Yes, Flame Jellyfish have a sting and therefore should never be touched.

If you ever need to put your hand into a tank with Flame Jellyfish, we recommend to wear latex gloves just in case.

Q
Are Jellyfish Guaranteed To Arrive Alive?

Yes, we offer a guarantee that all of our jellyfish will arrive alive.

In the unlikely event that they do not survive the trip with the courier, then we will offer to replace your jellyfish free of charge. All we require for this is photo or video evidence at time of delivery (i.e. in the packaging they were delivered in), sent to us on the same day as your delivery.

Q
How Do I Feed My Jellyfish?

We have a full guide, featuring a handy video, here: Feeding Your Jellyfish

Q
Can Amakusa Jellyfish Be Kept With Other Jellyfish Types?

No, unfortunately not. Due to their nature, Amakusa will typically try to eat other jellyfish species – so not ideal for keeping together!

Q
My Amakusa Jellyfish’s Tentacles Are Getting Tangled, Is This A Problem?

This is something Amakusa have to deal with either in captivity or in the wild. When scrapping over food, Amakusa Jellyfish will frequently get tangled up in each other’s tentacles.

This is not an issue and they will resolve it themselves!

Q
Can I Add Cleaner Snails To My Tank?

We don’t recommend it. There is generally no algae issue with our jellyfish tanks, and therefore cleaner snails are not necessary.

There is potential for the cleaner snails to introduce harmful bacteria or interfere with the jellyfish’s water environment, and so for this reason too, it’s not recommended.

However, you may introduce blue legged hermit crabs, if you want a companion for your jellies. These are useful in that they can eat food that has settled on the bottom of the tank, that the jellies may have missed – so can achieve the same result as a cleaner snail in that terms of keeping your tank clean.

Q
Can Flame Jellyfish Be Kept With Other Jellyfish Types?

No, unfortunately not! Flame Jellyfish must not be mixed with other jellyfish species.

Q
What Payment Methods Do You Accept?

We currently accept Paypal, as well as major Credit and Debit Cards.

Q
I’m Ordering A Jellyfish Tank And Live Jellies, Will They Arrive At The Same Time?

No, we arrange deliveries so that your jellyfish tank (and any other accessories which are ordered) arrives first.

We then discuss with you via email to determine the best date for your jellyfish to arrive – i.e. a day when you are home to sign for the delivery.

Your jellyfish tank’s water will need to be “cycled” before jellies can be added, a process which typically takes 10-14 days. A guide to this can be found on our Help and Advice pages. (It isn’t as difficult as it sounds!)

Q
Do You Deliver Internationally?

We currently accept orders online for UK, Republic of Ireland, USA and most European customers.

For a full list of delivery availability, see our Delivery Page.

If we don’t currently deliver to your country, please email us at info@petjellyfish.co.uk with your request and we’ll see what we can do.

Typically, the tanks and accessories can be sent anywhere internationally – however obviously there is some additional postage cost involved with sending abroad.

Live Jellyfish can only be delivered to the UK, Ireland, USA and some European countries. We can’t currently send further afield as it’s unlikely the jellyfish will survive longer distance journies.

Q
Is Your Checkout Secure?

Yes!

We use SSL encryption from the very minute you land on our website. All the way through your purchase, your details are protected, safe, and secure.

You can tell a website is safe if the ‘green padlock’ is showing in your browser’s address bar!

Q
Do you Deliver to the UK?

Yes! We are based in the UK.

All of our products can be shipped to anywhere in the UK.

Q
Can I Keep Jellyfish In A Regular Fish Tank?

No! Unfortunately not. In a ‘normal’ fish tank, jellyfish would get stuck to the sides of the tank.

They would also sink! Jellyfish are really bad swimmers – in the ocean, they rely on ocean currents and tides to stay afloat and move from place to place.

Jellyfish need constant water flow to keep them ‘floating’ around in the tank, and our tanks are specially made with jellyfish in mind.

Q
Where Can I get Salted RO Water?

If you’re a UK customer, we have a helpful page to Find Your Local Aquatic Shop.

On this page, you can simply enter your post code or local town, and we’ll locate the closest aquatic shop to you, which will sell pre-mixed Salted RO Water.

It’s always best to check with the aquatics shop, that they have the water available, however.

Alternatively, take a look at our Caribsea Sea-Pure Saltwater, which is bottled pre-mixed Salted RO Water and is available to buy online.

For non-UK customers, check with your local aquatic shop. Most aquatic shops will sell Salted RO Water pre-mixed ready to go.

Q
Do Pet Jellyfish Sting?

Moon JellyfishBlue Blubber Jellyfish and Red Cross Jellyfish do not sting. These types of jellyfish therefore make great pets!

Amakusa and Flame Jellyfish do have a sting, and so should typically be for more experienced jellyfish owners.

Q
How Long Do Pet Jellyfish Live?

Moon Jellyfish can live for up to, and if treated well, over a year in captivity!

Other species (Blue Blubbers, Flame Jellies, Spotted Lagoons, Red Cross Jellyfish & Amakusa Jellyfish) typically live for 12 months, again depending on your level of care and maintenance.

Read more on our ‘How long do Jellyfish live?‘ advice page.

Q
What Do Pet Jellyfish Eat?

We supply a range of highly nutritious pet foods which are available to buy online.

Ocean Nutrition Instant Brine Shrimp is a highly nutritious dried food, which is easy to use and ideal for beginners. The negatives are that uneaten food will eventually sit on the bottom of your tank, and so using this food source can mean needing to clean your tank more frequently.

We’d recommend all our jellyfish keepers to use a Baby Brine Shrimp Kit – a live food, which is the perfect food for jellies whether in the wild or being kept as a pet. This kit allows you to hatch your own baby brine shrimp. While this may sound daunting, it’s incredibly easy, and simple. The fact that it is live food also means that the food continues to “swim” around the tank, rather than settle on the bottom of the tank like a dried food would – so less cleaning is required.

Q
How Often Do Jellyfish Need Feeding?

Jellyfish are different to normal animals in that they don’t starve; instead they use food for growth.

The below is a typical guide if feeding with live baby brine shrimp.

Want your jellies to grow in size? Feed twice a day.

Want your jellies to stay around the same size? Feed once a day.

Want your jellies to shrink? Feed once every couple of days.

There is no set ‘rule’ for feeding jellyfish, and indeed feeding quantities and patterns will vary depending on the type of food being given to your jellyfish.

Q
What Water Do I Need For My Jellyfish Tank?

Jellyfish tanks need Salted RO Water, it’s important you use the proper stuff!

We sell Caribsea Sea-Pure Saltwater, which is pre-mixed Salted RO water, ready to use.

You can also obtain pre-mixed Salted RO Water from most aquatic shops. This can be a cheaper alternative, especially if you have an aquatics shop local to you (no delivery cost of shipping the water to worry about). Typically pre-mixed Salted RO Water from an aquatic shop costs around £5-10 for 20 litres.

We have an Aquatics Shop Finder page to help you find a local shop.

If you ask for Salted RO Water with an SG of 1.025 then this will be your best option as it can be bought pre-mixed.

The water should be as close to 1.025 SG as possible – which works out at 38g salt per 1 litre of RO water.

Q
What Maintenance Is Required For Keeping Jellyfish?

We’d recommend to follow the below advice in order to keep your jellyfish fit and healthy!

The below advice is relevant for owners of a Jellyfish Art Cylinder Nano tank:

Daily

  • Feed your jellyfish once or twice every day.
  • Remove any uneaten food from the tank.

Weekly

  • Change 10% of the water in the tank – this will keep the water clean for the jellyfish. This is most important to their livelihood.
  • Add 1 cap-ful of JellyBio Maintain to the newly introduced 10% water.
  • Wipe away any algae which may appear on the inside of the tank.

Monthly

  • Replace the Chemi-Pure Blue Nano pack.
  • Rinse the black sponge filter (with Salted RO water), to remove any trapped food debris.

See our Help and Advice section for further help, videos and guidance.

Q
How Are Jellyfish Delivered?

Our jellyfish are sent by overnight courier, and so spend relatively little time in transit.

They are sent in plastic bags full of Salted RO water, typically no more than 2 jellies to a bag (depending on the size of the jelly).

The boxes are packed with polystyrene foam to ensure they are not moved around while in transit, and they are kept secure inside a polystyrene box, with another cardboard box on the outside.

The boxes are labelled with “live fish” markings to ensure the courier knows to handle the box with care, and that it’s an urgent delivery.

If you order a tank and jellyfish – we will send the tank first, followed by the jellyfish a few days later. This way you have time to get the tank up and running before the jellyfish arrive – no panic!

Q
What Should I Do When My Jellyfish Arrive?

Although every effort is made to ensure your jellyfish arrive quickly and safely, you need to do your bit too!

Jellies are shipped overnight, so they spend as little time in transit as possible – but they will therefore need some care to adequately introduce them to your new tank, it’s not just a case of opening their bag and dropping them into the tank!

Once they arrive, follow our steps on the ‘How Do I Introduce Jellyfish To My Tank?’ part of this FAQ page and your jellies will be happy and energetic in no time!

Q
How Do I Introduce Jellyfish To My Tank?

As with any pet, jellyfish need to be introduced slowly to their new environment.

Let the jellyfish float in the tank in their bags for around 40 to 60 minutes.

You can introduce small amounts of water from the tank into their bags during this time to help them acclimatise to the new conditions. Consider that you are trying to achieve (gradually!) the water in their bags to be the same temperature as the water in the tank.

After 40-60 minutes, you will be able to introduce the jellyfish to their new tank.

Let your jellyfish settle in for the first day, they won’t need feeding until the second day – try to keep things simple for them in the first 24 hours.