Jellyfish FAQ

If you have a question about keeping jellyfish in aquariums and don’t see the answer here, email your question to us at

Jellyfish Care Questions

Not at all... In fact they are quite easy to take care of. There are well laid out husbandry guidelines for numerous species of jellyfish. With the easier to care for species, there are a few simple tasks to do and procedures to be followed. As long as you are doing the tasks, things are pretty simple. Many of our customers have never had an aquarium before starting their jellyfish aquarium.
Jellyfish aquariums are (generally) very simple saltwater tanks. Keeping jellyfish in a jellyfish aquarium requires doing pretty much the same simple tasks as keeping any other type of well maintained aquarium. The frequency of maintenance tasks is partially determined by the size of the aquarium, the number & size of jellyfish and the water chemistry.

This is a basic list of the maintenance tasks you’ll do to keep your jellyfish happy…

Feed. Feeding smaller amounts, more frequently is always better if you have time.

Clean the inside of the aquarium. Wipe the film build-up off the walls and suck/vacuum any debris off the floor.

Do a 10% to 20% water change. Mix the salt water in advance, remove the desired amount of water from the aquarium and slowly add the new water back into the aquarium. You can vacuum the bottom of the tank as the same time. Clean the filter sponge in the old water you just removed from the aquarium (never tap/freshwater).
Check the water chemistry. Could be more of less frequent based on how established / stable your aquarium (nitrogen cycle) is.
Different species eat different things.
The most commonly kept species, the Moon Jellyfish (and many others) eat zooplankton. There powdered, liquid and frozen jellyfish foods available that contain a mix of planktons that are appropriate for feeding jellyfish.
The powdered food is the most convenient to feed but, it make a mess and will require you to do more aquarium maintenance.
Other commonly available foods include, frozen baby brine shrimp and live, newly hatched brine shrimp (that you hatch yourself in a simply, DIY hatchery made of a pop bottle).
Live food is the best, most nutritious for your jellyfish. Yes, is is a (simple) task to hatch the brine shrimp. But, is is worth it as your Moon Jellyfish will be healthier and you will need to do less aquarium maintenance as live, newly hatched brine shrimp swim in the water and almost all of it gets eaten. Very little settles to the bottom of the aquarium or ends up in the filter, where you will need to clean it.
For people with small (2 to 10 gallons) jellyfish aquariums, moon jellyfish are quite simple to care for. And, they are quite easy to feed as they will readily accept dry jellyfish food. The Atlantic Sea Nettle is relatively easy to care for. However, because of their extremely long tentacles (a 1-2” jellyfish can trail 12-18” of tentacles), they require a larger aquarium (minimum 20 gallons) and lower stocking density. They are tolerant of a wide range of water parameters and will accept a number of convenient frozen fish foods (amongst other things).
The short answer is… It depends. Many of the commonly available jellyfish species have different husbandry requirements (size, temperature, diet, water parameters and so on). So, “it depends” on their individual care needs, which you will have to look into and see which might be compatible. You can see the basic care requirements HERE. We don’t say that it can’t be done. We are saying that we will not make any specific recommendations. Most jellyfish keepers keep one type of jellyfish at any one particular time.


Website & Ordering Questions

No... Order your jellyfish aquarium and supplies first. It can be delivered via standard ground shipping to save on cost. Once you have received your aquarium and are ready... Get it set up and cycling, then come back to the website and order your new jellyfish. Jellyfish NEED to be shipped via express. Please select that shipping option during check-out.

Generally people order their jellyfish a two to four weeks after getting and setting up the aquarium.
For a shipping quote, go to the website and put the items you are thinking about ordering in the site's shopping cart/bag and hit check-out. Put in your postal code and it'll figure it out for you.

If you are just looking to find out the shipping rates, there is no need to enter payment information.
We ship jellyfish anywhere in Canada! To minimize the transit time, we arrange the last pick-up of the day here, This minimizes the time in transit.

The jellies are double bagged in heavy weight fish bags and packed in into Styrofoam insulated coolers inside cardboard shipping boxes. Heat or ice packs may be used to regulate the temperature, depending on the time of year and weather.

Unlike fish that you would buy from an aquarium store that come in a bag filled 2/3s with air/oxygen, some species of jellyfish are bagged with NO air in the bag. Many jellyfish require very little oxygen. And, a much larger danger is air bubbles becoming logged in the jellies tissue which can cause a lot of damage to a jellyfish.

All livestock shipments are shipped next day, express on the first business day of each week. Your new jellyfish and should arrive to you the next afternoon. You will recieve an email with tracking information. Please ensure that there is someone available to receive the delivery.

All livestock shipments MUST be shipped overnight express or local pick-up (in the Toronto area).

When ordering livestock please choose one of the following methods:
  • UPS Express Early - 1 business day*. Delivery by mid morning to most locations.
  • UPS Express - 1 business day*. Delivery by midday to most locations.
  • UPS (Express) Saver - 1 business day*. Delivery by end of day to commercial addresses in metropolitan areas and most residential addresses.
    • Delivery to residential address is usually next day but that is not guaranteed by UPS, if delivery is 2nd day, our ‘arrive alive guarantee’ does not apply.
  • Other Arrangements
    • Orders beyond UPS’s overnight Express delivery service MUST be organized (via phone or email), in advance.
      • Any additional charges for packing or shipping will be billed separately.
    • People in the Toronto area that want to pick up their order at our office. Very limited pick-up hours available, check prior to ordering.
*We ship livestock on the first business day of most weeks (normally Monday). The delivery will usually arrive to you the next (normally Tuesday), thru the day. *If you are ordering on Friday, Saturday or Sunday, the shipping methods listed during check-out will automatically say 2 or 3 day shipping. The website automatically calculates for non-business/delivery days so disregard that info. Just choose one of the shipping methods listed above.
All livestock is shipped via UPS Express. Unfortuniatly, UPS does not deliver to Post Office Boxes. If your address is a PO Box, in order to receive jellyfish, you will need to arrange to have them delivered to a either a street address (if available) or a UPS Access Point, Depot or UPS Store (location info is available on the UPS website). Find a location that works for you and make a not in the ‘Order Comments’ field during checkout on our website. If this is your situation, be aware that you will need to pay for your order via Interac eTransfer! Because of security policies, we are only able to ship orders paid via credit card to the billing address associated with the credit card used.
Although we do not operate a retail store, orders placed and paid online can be picked up at our office in Toronto. As we do not have regular operating hours or have jellyfish available for sale at the office, arrangements must be made in advance.

Contact us prior to submitting your order to find out if the schedule works. Then select the "Other Shipping Option" during the checkout procedure. Make note of the pick-up day/time in the order notes section during ordering.

All transactions are completed on the website. We have no ability to process/take orders or accept payment at the office.
Different aquariums come with different supply and accessory packages. You’ll need to check the produce description of the individual aquarium you are interested in to see what it comes with. The quarterly maintenance packages (ordered separately or add-on) have most of the supplies that you’ll require to maintain your jellyfish aquarium and feed your jellyfish. The basic starter kits contain pretty much all of the supplies that come in the quarterly packages as well as the accessories you'll need to care for your jellyfish and maintain their aquarium. Other recommended items are... test kit/strips, algone, prime(detoxifies ammonia in emergency situation) and brine shrimp eggs (newly hatched brine shrimp are by far the best food for your jellyfish). If you want to be able to measure the salinity more accurately than the simple hydrometers allow, consider a refractometer. Alternatively, the deluxe starter kits contain all of the basics and recommended items. Higher quality components and larger quantities.
On our website (, we sell all of the supplies and equipment that you need to set-up & maintain a jellyfish aquarium and care for your jellyfish.

We do ship Canada-wide. But, alternatively the majority of supplies you'll need are the same as used in any other type of aquarium. They are generally available from many (well-stocked) local aquarium/pet stores.

The only thing that you'll have trouble finding locally is jellyfish food. And, in some areas, brine shrimp eggs/cysts. We offer both of these items on our website and there is a FREE SHIPPING option (via regular (slow) mail, so, don't leave it 'till the last minute).


General Jellyfish Questions

Technically, all jellyfish sting. However, of the hundreds of jellyfish species out there in the world, very, very few of them have a sting powerful enough to have any effect on humans. If you were to touch a Moon Jellyfish (for example), you would likely feel nothing at all or a minor tingle at most.

The best advise is to check the description of the species on it's webpage.
Yes. Kept in good water conditions and fed lots of good, nutritious foods, jellyfish can grow remarkably quickly. In a small aquarium, the key is to manage the amount of food your jellyfish receive in order to manage their size. Most jellyfish species will get too big for a small aquarium if they are fed too much.
That depends a lot on, you...

In the wild, moon jellyfish live for approximately one year. In a home aquarium, it isn't uncommon for them to live longer than their normal/wild lifespan. Some jellyfish keepers, have their jellyfish for a couple years (occasionally more). Others have 'issues'. Jelly life-expectancy is highly dependent on the aquarium keeper. The maintenance regime, how established/stable the (nitrogen cycle) aquarium is, water chemistry and nutrition are all play rolls in jellyfish health.

Different species of jellyfish have varying life expediencies. Check the stats of the particular species you are interested in.
All jellyfish kept commonly kept in aquariums are saltwater. But, don't let the 'saltwater aquarium deter you, they are actually really easy to deal with. All you need to do is mix approximately ½ cup of marine/jellyfish aquarium salt mix/powder with each gallon of purified or distilled fresh water, let the powder fully dissolve, check with a hydrometer, and it is ready to go.

There are freshwater jellyfish. However, they do not survive in aquariums.
The majority of the jellyfish that we sell born and raised in aquariums.

We import our jellyfish from aquaculture facilities in Hong Kong, Japan and California.
The short answer is… It depends. Many of the commonly available jellyfish species have different husbandry/care requirements (size, temperature, diet predatory (some jellyfish eat other jellyfish), water parameters and so on). So, “it depends” on their individual care needs, which you will have to look into and see which might be compatible. You can see the basic care requirements HERE.

We don’t say that it can’t be done. We are saying that we will not make any specific recommendations. Most jellyfish keepers keep one type of jellyfish at any one particular time.
Jellyfish will not survive long in a regular aquarium. Jellyfish aquariums are task built to meet the specific circulation/flow needs of jellyfish. They would get sucked into pumps and filter intakes and/or languish in dead spots. The other things commonly present in aquariums (rocks, corals, other decorations) would also harm jellyfish.

There is no way to replicate this required flow pattern in a regular aquarium with traditional filtration systems and pumps.


Water Quality Questions

As moon jellyfish are the most commonly kept species of jellyfish, these are the water parameters for them…

Moon jellyfish have a wide range of acceptable temperatures and salinities. As long as changes in temperature and salinity are made slowly, moon jellyfish are tolerant of less than ideal parameters.

Ammonia and nitrite (common in newly set-up aquariums) are harmful to jellyfish. They will tolerate ammonia and nitrate for a short while but if conditions are not improved, they will suffer health problems.

Parameter Ideal Range
pH 8.0 – 8.3
Salinity 28 – 34ppt
Ammonia (NH3) 0.0ppm
Nitrite (NO2-) 0.0ppm
Nitrate (NO3-) 0.0 – 15.0ppm
Temperature 15 – 25c

As jellyfish are comprised of such a high percentage of water, it’s best not to chance it. Tap Water can contain heavy metals, impurities and trace amounts of nitrate & phosphate. Depending on your municipal water supply, it could be more or less. It’s kind of an unknown. It's best to use purified water.

To mix your jellyfish aquarium’s saltwater, it is recommended that you use purified water. Either reverse osmosis (‘RO’ or RODI) filtered water or distilled water. Some aquarium stores also sell pre-mixed, purified saltwater (check the salinity before use) and/or jugs of natural seawater.   Check the label... what you are looking for is a Total Dissolved Solids level of 0.0ppm in the water.