I've had rabbit fish that pick at HA but they never really fully got rid of it all, definitely got rid of most of it but not all. Oddly though every naso tang I've ever had (I had 3 in total, including the one I still have) seems to love HA and has been good at getting rid of it and keeping it gone. Doesn't eliminate the source causing the HA of course but makes the tank free of it, or at least they have for me. I think the sea hare would work well for you in this case, just watch them around powerheads, I tried one and sure enough 2 days after getting him he got sucked onto the powerhead and died.
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One more fish should be ok?, right!!!  - Laurie
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