Matted Filefish or Copperband Butterfly?

[Reef Pilot]

I've had both Copperband and Pearlscale Butterfly fish. The Pearlscale were the best at ridding my tank from a severe aiptaisia infestation. When I first got them (about 2 years ago) they would nip at some corals, but now don't touch them. I feed them well, and they seem to have changed their tastes. However, they still constantly scour the rocks looking for a bite. Not sure what they are finding, but haven't seen an aiptaisia for a long, long time.

The other advantage with Pearlscales, is that you can have more than one in a tank, unlike Copperbands.