I've tried pepperment shrimp, copperband butterflies, tahetian butterflys and apatasia x. I find the pepperment shrimp do the best job, especially quality marine's monoco pepperments. The only downfall to using shrimp is they can't tackle larger apatasias, only very tiny ones. Generally I use apatasia x for large apatasias and I let the pepperments take care of the small ones. Copperbands work well but they are hit or miss, some never touch apatasia, some gobble it up! Tahetian butterflies work really well but in my experience they aren't quite as reef safe as a copperband.
They also make an electric wand that zaps the apatasia with an electric current. Supposedly it is totally safe for fish but I'd be very concerned about having a stray electrical current in my tank.
They also make an electric wand that zaps the apatasia with an electric current. Supposedly it is totally safe for fish but I'd be very concerned about having a stray electrical current in my tank.

