Baby jelly fish in my tank!!!

Jellies will not survive for long in any fish tank unless you are will to do extensive expensive setups. Go to any aquarium and notice what the jely tanks look like - they are species only and they are round. Jellies aren't good swimmers and really rely on the current and tides to help them move, so they can easily get stuck in corners. They also are generally very temperature sensitive and require chillers to live for any length of time. The best setup I found for purchase was $10,000.
 
So many inverts have larval stages that look like that - would be tough to be certain that it's a jelly even though it looks & swims like one. Jellies do require special tanks w/ special overflows for their filters to prevent damaging them.

Also consider that, depending on the species, if you were to manage keeping it alive, it could grow into something quite capable of killing everything else in the tank.
 
It's not a ctenophore (aka comb jelly). Those are usually oblong and have 8 rows of comb like fused cilia. The most likely explanation is that you have what is called a hydromedusa--the free swimming life stage of a hydroid polyp. Basically, the primary stage of hydroids is the sessile polyp. The polyp buds and produces medusae, which then swim off and comprise the sexual stage of the life cycle. The hydroid spends most of its time in the polyp stage, whereas jellyfish are the opposite.
 
Amphiprion said:
It's not a ctenophore (aka comb jelly). Those are usually oblong and have 8 rows of comb like fused cilia. The most likely explanation is that you have what is called a hydromedusa--the free swimming life stage of a hydroid polyp. Basically, the primary stage of hydroids is the sessile polyp. The polyp buds and produces medusae, which then swim off and comprise the sexual stage of the life cycle. The hydroid spends most of its time in the polyp stage, whereas jellyfish are the opposite.
Click to expand...

^ what I was trying to get at, but lots better.:)
 
Amphiprion said:
It's not a ctenophore (aka comb jelly). Those are usually oblong and have 8 rows of comb like fused cilia. The most likely explanation is that you have what is called a hydromedusa--the free swimming life stage of a hydroid polyp. Basically, the primary stage of hydroids is the sessile polyp. The polyp buds and produces medusae, which then swim off and comprise the sexual stage of the life cycle. The hydroid spends most of its time in the polyp stage, whereas jellyfish are the opposite.
Click to expand...

Allow me to say one more time how glad I am you're back. I love these kinds of posts from you as I always learn so much.
 
The odds of one of those fish reaching the 'I'm hungry enough to try that' stage is way too high.
 
Amphiprion said:
It's not a ctenophore (aka comb jelly). Those are usually oblong and have 8 rows of comb like fused cilia. The most likely explanation is that you have what is called a hydromedusa--the free swimming life stage of a hydroid polyp. Basically, the primary stage of hydroids is the sessile polyp. The polyp buds and produces medusae, which then swim off and comprise the sexual stage of the life cycle. The hydroid spends most of its time in the polyp stage, whereas jellyfish are the opposite.
Click to expand...
but of what hydroid species... as far as I know, none of the commecially avalible polyp species take a form like that.
 
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