Butterfly fish eating aiptasia
 

They are actually Pearlscale Butterfly fish. I had them in a QT tank for a few weeks and just moved them to the big tank. I would place a live rock full of aiptasia into the QT from the big tank, and they cleaned each one out in a couple days. I didn't feed them anything else, so trained them to eat the aiptasia that way.

They are already pecking away at the aiptaisia in the main tank now after a couple days. They had to get over the Yellow Tang harassing them the first day, but they are now hunting and pecking away at the aiptasia in my main tank. So will see how it goes. I noticed they don't touch the big ones, though, waving away in the water flow right in front of them, but seem to go after the hard to get ones hiding in their holes. I hope they eventually go after the big ones, too, as there must be hundreds in my tank.

One thing I noticed with these Butterfly fish, they like to play follow the leader. When one finds an aiptaisia, the others come by and also get in on the action. Sometimes, one pulls a whole aiptasia out, but it is too big to swallow, so they all then pull at it like chickens going after worms. Quite interesting to watch.

RP