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.
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).
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.
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 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 (redeem the rewards points that you got when you purchased the aquarium for a discount off of your jellyfish order). 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.
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.
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.
The basic starter kit has pretty much all of the basic supplies and accessories you'll need to care for your jellyfish and maintain their aquarium. Other recommended items are... test kit/strips, algone and prime(detoxifies ammonia in emergency situation). If you want to be able to measure the salinity more accurately than the hydrometers allow, consider a refractometer. Alternatively, the deluxe starter kits contain all of the basics and recommended items. Higher quality components and larger quantities.


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.
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.


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.