reeferious, got any pictures of said set up and animal? The method sounds a bit ghetto, but obviously it gets the job done right.
For pelagic jellies, cornerless tanks like kreisels are necessary because corners tend to be dead spots. If a pelagic jelly gets stuck in a corner, it has a hard time getting out and ends up abrading itself on the tank wall/bottom. My belief is that upside down jellies, being benthic by nature, should have a much tougher and more resistant bell. They live top down on the sand after all. I would imagine they'd be fine in a standard tank... mind you I have little real experience with jellies. this is mostly just theory on my part.
fishoholic, i have no idea. certainly no big fish like tangs, nothing that bites out of curiosity like angels triggers and puffers, no big swimmers like tangs, nothing that sleeps in the sand like big wrasses (small ones under 4 inches might be okay), nothing aggressive like damsels, nothing that would try to host the thing like a clown... mind you I am very conservative. Here, I encourage experimentation considering this is a bit of an unknown field. As far as I know, upside down jellies are not piscivorous; i just worry on behalf of the jelly... the jelly is the fragile one, not the fish. Im certain it would be fine with small peaceful column dewlling fish like firefish or anthias. then I might try gobies or blennies which i suspect would be fine too. im not sure if i would venture beyond that level... or what direction i would go if I did.
on a related note, I might also be careful with my invert selection... nothing with pincers (crabs/hermits), big spikes (all urchins, some stars), nothing known to eat cnidarians (some shrimp, stars and fish). Im sure snails would be fine, even the sand dwellers like nassarius.
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