Well, if they stay in one spot, that's certainly a good sign. If you haven't been told already, anemones are generally challenging creatures to keep, but I can certainly see the tempatation for $10 each. That's a pretty amazing price.
Most people don't have problems handling BTAs. Their nematocysts generally can't penetrate human skin, especially the palm of the hand. If you have an open cut, I'd certainly be careful, though. Also, there are people who have allergic reactions, so it's always best to use caution.
Most meaty foods fed once or twice a week work well. Silversides seem to be the food of choice for most people who keep them. I alternate with mine, feeding it mysis, silversides, krill, shrimp and squid. I'll also feed it a little of whatever I'm eating if I get seafood for dinner (grouper, snapper, etc.). Mine seems especially fond of grouper. Other than that, just keep your water parameters nice and stable. They can be very sensitive to PH or temperature swings. There seems to be debate on whether they like to have some nitrates in the water or have them undetectable. The people on here who have the most success seem to have undetectable nitrite and nitrate levels. . .in short, pretty pristine water conditions.
Anyway, best of luck! If they stay in one spot and grab food readily with their tentacles, you're probably doing good. If they start wandering the tank, can't grab food, start losing tentacles, or anything else strange, those are very good signs that they're not happy.
but from my experience, they really don't "float" but they sink.
