Any jellyfish will need to be in a species tank. The Upside-down or Casseiopia jellies are probably the easiest to keep. They are light-requiring/photosynthetic jellies. I had one for about 6 months in its own tank but my wife kept feeling sorry for it so it went into the frag tank & got blown around into the rocks & damaged or sucked into the powerhead & damaged.
The are very hard to keep because of their delicate bodies (mostly water). They are prone to getting sucked into powerheads, so you'll have to put a sponge over your intake.
I bought two recently thinking they were Cass. jellies but turned out they weren't & any other type needs a specially designed cylindrical tank with no LR or powerheads, but with some flow to keep them suspended. These ones lasted a few weeks but eventually wasted away or got damaged from getting stuck on even the tiny salt-mixing powerheads I used.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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