Why are some bubble tip anemone's bubbled and some are not? I've been feeding my rainbow bta's minced fish food along with feeding the fish since I've had them and they never bubble. I started with 1 and now I have 5 - typical. I decided to try something new. I feed my fish chopped fresh oysters a couple times a week and I notice when I put the chopped oysters in a cup with some tank water, the water gets very cloudy. I decided to just siphon the cloudy water off with a turkey baster and spray it at the anemone's instead of chopped food. Since then, they are starting to noticeably bubble - at least 4 out of the 5 have. Does anyone else do this, know about it, is it a thing everyone does and I just don't know about it? I'm thinking they be more filter feeder feeders than I suspected.