You can keep any peaceful fish that isn't prone to eating coral polyps, the problem is keeping the jelly. They are not easy ot keep, you have to have large open sandy places for them, if they get stuck in the rockwork they will tear their bell and die, they also sting any corals or anemones they come in contact with so it is hard to keep them in a typical reef. Another problem with them is they are photosynthetic so you need reef lighting but can't keep them with other reef animals. They do best in a tank by themselves with reef style lighting and no or very little live rock, and few other animals.
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