Jellyfish Aquariums and Care: Ask Me Anything

BRS

A Toadstool Leather

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I've kept a few different species of Comb Jellies. They're very delicate and picky jellies- they either do really well or go downhill very fast. Over the years I found a couple of tricks that make keeping them easier and successful.

Almost everyone sells Mnemiopsis leidyi Comb Jellies. These are by far the hardiest. I've worked with other species that are very very sensitive. So if you by Comb Jellies they're most likely Mnemiopsis but just check to make sure. Here are some key tricks I found to have success with them:

1) Colder is better. Mnemiopsis are an all-seasons type jellyfish. I've found them in 40 F water all the way to 83 F. Colder is better because it slows down their metabolism while also limiting the growth of bacteria. If you can, I like to keep them at around 60 F, but even 68 is better than tropical. They life cycle stretches substantially longer with cooler water.

2) They need quality foods. Dry foods really don't work with Comb jellies. They need live or preserved baby brine shrimp. Rotifers are great for diversifying their diet as well. Hikari frozen rotifers and Rotifeast are two excellent products.

3) Make sure your tank is clean and cycled. Most jellies are actually not super sensitive to ammonia. Comb Jellies on the other hand really don't like ammonia or pH swings. This isn't any more difficult than with fish or corals, just make sure their tank is nice and cycled before you add jellies.

I wouldn't rate Comb Jellies as being very difficult but rather they have a specialized set of care requirements. If you're dedicated to keeping them, it can be done with great success.
comb jelly 3.jpg
Honestly the feeding aspect of jellies keeps me away from them. Coral are difficult but if your water,light, and flow are good you are set. Maybe one day I will take care of comb jellies since that has been a dream of mine.
 
Zoanthids

Sallstrom

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Hi @TravisTheJellyfish

I work at a public aquarium in Sweden and we collected some Gonionemus vertens, Clinging jellyfish, this summer. They are not very common here in Sweden but this summer they were found along our west coast.

I just wanted to check if you have any info on breeding them?

Thanks in advance!

/ David
 

Scubafrog

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Honestly the feeding aspect of jellies keeps me away from them. Coral are difficult but if your water,light, and flow are good you are set. Maybe one day I will take care of comb jellies since that has been a dream of mine.

My daughter and I had 6 small moon jellies in a Cubic Pulse 80. I did weekly (5 gallon) water changes and fed them daily but unfortunately they shrank to nothing and eventually disappeared into the water after only a little over a month.

All water parameters were in check and flow was good. The only thing I can think of is that our food wasn't enough to make them grow. We fed Ocean Nutrition Instant Baby Brine and frozen baby brine. Also, tried Jelly Deli once or twice but I didn't like all the waste on the bottom of the tank.

Aquarium did a full 4 week cycle and parameters were in check before adding the moon jellies. They did well for about 2-3 weeks and then just started shrinking in size.
 
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TravisTheJellyfish

TravisTheJellyfish

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My daughter and I had 6 small moon jellies in a Cubic Pulse 80. I did weekly (5 gallon) water changes and fed them daily but unfortunately they shrank to nothing and eventually disappeared into the water after only a little over a month.

All water parameters were in check and flow was good. The only thing I can think of is that our food wasn't enough to make them grow. We fed Ocean Nutrition Instant Baby Brine and frozen baby brine. Also, tried Jelly Deli once or twice but I didn't like all the waste on the bottom of the tank.

Aquarium did a full 4 week cycle and parameters were in check before adding the moon jellies. They did well for about 2-3 weeks and then just started shrinking in size.


I always miss notifications about this thread so I apologize for replying two months late! I have used Ocean Nutrition's Instant Baby Brine Shrimp. They basically take baby brine and pressure cook/autoclave them to sterilize it. Something during that process changes the food and the jellyfish can't digest it at all. They definitely eat it, but they ultimately can't digest it. The food also goes bad really fast and you end up adding a ton of bacteria to your tank because of that.

The Jelly Deli product is total snake oil. It frustrates me to see them advertising it as a jellyfish food. I've used it personally and it done a number of different tests on it. Supposedly it helps grow copepods and microfauna in your tank but doesn't directly feed the jellyfish. In my tests, I found it caused jellyfish to shrink faster than if they weren't fed at all.
 
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TravisTheJellyfish

TravisTheJellyfish

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Have you ever kept Craspedacusta sowerbii?
@TravisTheJellyfish

And just a odd ball question, have you ever eaten jellies?

I have kept freshwater jellies. Last Autumn I collected some in a lake nearby. Here's a video I made on them:
I tried a chili jellyfish soup dish from a local asian market several years ago. Texture was super weird and they don't have much taste until spices are added. Rhopilema verrilli is frequently the species consumed in China, and probably what I had.
 

Scubafrog

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I always miss notifications about this thread so I apologize for replying two months late! I have used Ocean Nutrition's Instant Baby Brine Shrimp. They basically take baby brine and pressure cook/autoclave them to sterilize it. Something during that process changes the food and the jellyfish can't digest it at all. They definitely eat it, but they ultimately can't digest it. The food also goes bad really fast and you end up adding a ton of bacteria to your tank because of that.

The Jelly Deli product is total snake oil. It frustrates me to see them advertising it as a jellyfish food. I've used it personally and it done a number of different tests on it. Supposedly it helps grow copepods and microfauna in your tank but doesn't directly feed the jellyfish. In my tests, I found it caused jellyfish to shrink faster than if they weren't fed at all.

Thanks for the info. Yep the food is the only thing I could think of that we did wrong as the aquarium flow and water parameters seemed spot on.
 

El_Guapo13

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I know this is an old thread, but I figured since it dors say to ask anything about jellies, I figures I would as this seema to be the most informative thread on jellies that I have seen so far.

So first, in my reef tank, I have a lot of Upside Down Jellyfish polyps hitchiking on my rocks, in my return chamber, on my heater (I still can't figure out how they haven't fried to death), and in my return chamber. So I get several strobiliation events every week, resulting in several ephyra floating around my tank, and eventually dieing to either getting sucked into the return, or killed/eaten by a coral...usually my aussie lords (vicious little [email protected]$#ards, had one eat an interstellar mushroom coral recently). So, I figured I would try to save a few from the reef's wrath. So now my questions:

1) How long does the ephyra stage last?
2) During the ephyra stage, how much light do they need, how much do they need to be fed, and what can they be fed?
3) What would be the preferred housing requirements once it reaches adulthood? I don't mean in terms of tank size, more in terms of what kind of filter would you recommend, how strong of water flow (I've heard the Upside Down Jellyfish do not need as strong a flow as other jellyfish, nor do they need the circular flow), temperature, sandy bottom or bare bottom? Yes I realize that filter size would be determined by tank size, but I mean more the type like, overflow plus return pump, basic overhanging filter, canister filter plus spitter return (like the 20 gallon filters that are sold for turtle tanks)?
 

duganderson

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I'm restarting my Jellyfishart 2 gallon tank since it's currently dry. Can I "seed" my sponge and media in my reef tank to get it cycle faster or are there creatures or things from my reef tank that may be dangerous to my jellies that my hitchhike into my jelly tank in the foam or media?

THanks, Doug
 
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amandaf18

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But again, I don't want to come off as biased or trying to self promote. There are around 3 companies that ship jellyfish in the US, and one that breeds multiple species of jellyfish.

You can hypothetically run a jellyfish tank on the same system as a reef. But reef tanks tend to have a ton of unwanted pests. Red slime, vermetid snails, worms etc. Our jellyfish come from a biosecure system, so it's nice to keep them clean. Cuts down on headaches down the road. They don't need any special salt. In my facility, we use Fritz RPM. We've made thousands of gallons and it's never let us down. Any salt that mixes clear, quickly is good for jellies. If the water is still cloudy, they're not going to like it.
Are you still growing jellies? What is your website?

I am looking to start a jelly tank. Most of the websites that I have found are out of the Cubic 80 like you have recommended. Have you seen then Omni 9 and 15? If so, what do you think of those?
 

Sushiboy225

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I have worked for other jellyfish companies in the past, and for the last several years I have owned a jellyfish aquaculture company. I'm not a sponsor here so I know there is some sensitivity to that. I will try my best to provide a fair review from my personal thoughts and experiences as a hobbyist.



Jellyfish Art - 5g cylinder
These were designed around Moon Jellies but I have had some clients keep different species in them with some success. Anything with short tentacles is a good bet. I really wish they had more capable filtration. I think it's a great buy for those wanting to stick to moons or don't want to add anything on.

Jellytank - 5g
This was done by some entrepreneur brothers in florida who don't keep jellyfish. I haven't tested it myself but that fact alone scares me. Additionally, I have had countless people come to me and say their JellyTank is leaking. The design seems sound, but like I said, I'd like to get ahold of one and try it for myself.

Orbit 20 - 6g
The Orbit has been around for a while, I've had several to play with and test. I've been able to keep a bunch of different species in these tanks. I also really love the fittings on the side so you can add a mini chiller or canister filter if you want. Basically, its good for any species of smaller jellyfish. The filtration is hidden in an outer ring on the tank, and it can be very difficult to get to. It's really nice to add a small canister filter like the TurtleClean 15 (it works great on saltwater tanks), then everything is easy to manage.

I would like to mention that the Pulse 80 is my favorite jelly tank on the market. They're expensive, but its worth it if you really want to get into jellyfish keeping. 23 gallons gives plenty of room for a variety of jellies and plenty of stability. You can hook them up to a sump adding an infinite set of possibilities.
Have you ever known someone to keep comb jellies?
 
BRS

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