I believe getting a
copperband butterfly fish (Chelmon rostratus) is definitely one of the best routes to take for eradicating Aiptasia in a reef tank. Providing you don't have any other fish in your reef tank that won't get along with it.
Not to necessarily endorse Live Aquaria or anything like that, even though we are a supply retailer, but we got our Copperband Butterfly fish from them almost 6 months ago and (Kaleb) our CBB's name does a great job at keeping the Aiptasia down in our reef tank...
At first he looked at the Aiptasia as if seeing them for the first time ever; granted he was a species supposedly from Singapore and more than likely he may have not ever seen them before in his native waters. I'd have to say it took him about a good month, and then finely to our surprise we actually saw him snap at one with his tweezers-like mouth. As you can imagine we were excited to finally seem him feast on an Aiptasia.
Now he will regularly keep them down; the smaller Aiptasia were the first to go; the larger ones, especially the really large ones took him about 3-5 days to fully get rid of. In any event the process of seeing him seek and destroy Aiptasia is truly amazing to watch.
If you do get one, try to get a small to medium one, these always seem to fare/adjust better; ours did just fine and is growing fairly quickly also...
Regarding any large feather dusters; since we don't have any I can't say would he would have done; regarding the other corals, within his first three days of being introduced to our reef tank, I do remember what appeared to be him possibly trying to nibble on a Xenia, but after that he never touched them again. Our button polyps he doesn't seem to bother at all; and now that he has realized the Aiptasia make tasty treats, we never see him nip at any of our other corals. It took him a while to start eating frozen foods and other types of foods, but now six months later he eats just about anything we give him. He is also the dominate one in the tank now, but doesn't harm anyone, just shows them who's boss; whereas in the past it was are Large Blue Damsel.
In conclusion, definitely a fish worthy of keeping and learning from. I'd have to say Kaleb has made my top ten list for
saltwater fish to keep. Tube worms/ Feather Dusters are fun too; but watching our Copperband eat the Aiptasia is killer
