Ball anemones?

[Slyguy00]

Haha your crazy man. From what iv read, these things produce like mushrooms and will sting and eat anything they can grab with their tentacles. I certainly think it has something to do with the missing fish as there is really nowhere else it could have gone. Its a sealed tank and there are no predators in it at all (That we know of anyways) Iv seen pics online of these things eating clownfish.