Jellyfish Tanks

Jellyfish tanks bring a peaceful and modern vibe to any environment. Jellyfish tanks come in many shapes and sizes, often more unique than regular aquariums. There are many different species of Jellyfish to choose from, including the Moon Jellyfish (Aurelia Aurita) or the Flame Jellyfish (Rhopilema Esculentum)

Jellyfish Tank Moon Jellies
Moon Jellyfish (Aurelia Aurita)

What’s the deal with Jellyfish Tanks?

Most people assume Jellyfish can only be kept at aquariums or in large tanks. This is certainly not the case! Even YOU can have a jellyfish tank!

Basic Necessities

A quick list of the bare minimum before starting your jellyfish tank (this is not an all-inclusive list for all types of jellyfish)

Jellyfish Tank

This tank must be round or have rounded corners. Jellyfish require constant flow to stay afloat. Corners in the tank create pockets of slow moving water where the Jellyfish can get stuck

Minimum tank size depends on species of jellyfish. Smaller species with short or nonexistent tentacles, such as the Moon Jelly, can live in tanks as little as 6 gallons


Without constant water circulation in the tank, the jellyfish will die. The circulation device must have intake and output holes smaller than the width of a pencil

Make sure the output of the device is facing an oblique angle towards a wall. Water must be moving throughout the entire tank.


The Jellyfish Tank filter must have an intake cover that is a flat surface and has small (smaller than a pencil width) intake holes. A protruding intake cover that is not flush with the wall can result in the Jellyfish getting stuck or killed.

Mechanical and biological filtration must be used to remove detritus and chemicals.This casing is also a good place for your air pump output.

Salt Water

Water inside the jellyfish tank should be at standard reef aquarium levels, Roughly in between 1.022 and 1.025. More information on Saltwater Aquarium salinity levels can be found here in this article from RateMyFishTank.

How expensive?

The cost of starting a jellyfish tank will vary depending on several decisions you will have to make throughout the process.

Here are some example of costs you will incur when starting a reasonably sized jellyfish tank.

$50-500 – The Tank

$60-400 – Filter

$30-120 – Circulation

$15-80 – Saltwater

Total Getting Started Costs: $155.00-$1,100

jellyfish tank picture moon jellies blue light
Fun Fact:

Jellyfish are OLD! Not just ‘dinosaur’ old either. Jellyfish are known to have been around for over 500 Million years! Some sources even say up to 700 million. This makes Jellyfish older than the first animal to ever have walked on land!

Choosing a Jelly for your Jellyfish Tank

Moon Jellyfish (Aurelia Aurita)

Moon Jellyfish are by far the most common choice for aquariums. Moon jellies prefer room temperature water, don’t sting, grow up to 3 inches, and live for up to a year. These are great for any beginner looking to start their first jellyfish tank.

Flame Jellyfish (Rhopilema Esculentum)

Flame Jellyfish are another hardy species, like the Moon Jellyfish. These jellyfish are sought after for their beautiful red tentacles. These tentacles still don’t pack much of a punch, and most people won’t feel a sting. Flame Jellyfish grow up to 20 inches (bell size), live for up to a year, and prefer room temperature water. This is a great jellyfish for people looking to step up from a moon jellyfish tank.

Blue Blubber Jellyfish (Catostylus Mosaicus)

Also known as The Jelly Blubber, the Blue Blubber Jellyfish are active swimmers with bright colors. These jellyfish require a bit more maintenance but the colors make it worth it. Blue Blubber Jellies grow up to 4 inches, live for up to one year, and prefer water temperatures between 75 and 82 degrees Fahrenheit.

Spotted Lagoon Jellyfish (Mastigias Papua)

This species goes by different names depending on where they are from. These types of jellyfish require special lighting to promote symbiotic algae growth within themselves. Spotted Jellyfish grow up to 8 inches, live for up to two years, and prefer water temperature in-between 75 and 82 degrees Fahrenheit.

And so many more!

The types of Jellyfish available in your area may vary depending on your local distributors. Local fish stores may not have tanks with jellyfish in them, but they can most likely direct you to someone who knows more. Additionally, online retailers like ExoticAquaculture are available with a vast selection of jellyfish to choose from for your new tank! Just make sure to research about the species you intend to purchase.

Don’t fall behind on tank maintenance!


Most jellyfish require at least a daily feeding. If the jellyfish in your tank is too big, simply put him on a diet! Skipping one day a time will cause your jellyfish to shrink in size. Alternatively, feeding more will cause the jellyfish to grow.


A quick rinse of the filter media, tubes, and casings every 14-30 days will make sure your jellyfish tank is always running smoothly. Algae growth in jellyfish tanks is usually stunned due to the lack of excess nutrients, however if you see algae try to immediately identify the root of the problem and remove the algae. For additional tips, check out our article Why is My Fish Tank Green?

Tank Stability

Water checks should be performed monthly to make sure the jellyfish tank is maintaining a healthy water composition. A quick test for salinity, pH, Alkalinity, and phosphates will give you a general idea to make sure things are headed in the right direction.

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