Not to run on your parade bro but they're more likely to starve themselves to death and not very much to look at. They'll just swim on that dark corner of the tank til they die. There are about 1 out of 10 owners who'd be lucky enough to keep these softies alive for months.
How about Cone Snail?
They're mostly found at tide pools, sandy areas, shallow to deep offshore waters. They use their dart-like mechanism near tip to stun and kill other fish and invertebrates. They cause burning pain, numbness, even coma or cardiac arrest.
Good thing I've found this post, I've been wanting to keep an anemone in my aquarium but I'm kind of skeptical about it. I've also found this (http://www.aquacon.com/anemone.html) and I hope this will be helpful to you as it is with me.