I have had a Pearlscale Butterfly in each of my tanks for several years now, and they keep them totally clean of aiptasia (where I once had many hundreds). You can read the 1st 7 or 8 posts in my journal link below where I mention them. Much easier to keep than Copperbands (tried them, too), but they also don't bother my corals (contrary to popular opinion).
However, being a butterfly, you do need to quarantine (prazi and hypo treatments) them and train them on regular fish food. If you just plunk them into your DT, they will most likely die sooner than later. I can give a few more tips on keeping them if you are interested.
So if you are up to that, they are nice looking fish, great community tank mates, and a permanent solution to your aiptasia problem.
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