I had a CBB and a Pearlscale Butterfly in the same tank, and they totally ignored each. It's the Yellow Tang that caused all the trouble,... but only for a couple weeks, and then they were all friends.
I still have a Pearlscale in each of my tanks, couple of the most useful fish I have. Better than CBB's for aiptasia eradication and don't bother my corals (SPS, LPS and softies). And much easier to keep than CBB's, as they eat pretty well everything, incl grazing on algae along with my tangs. I have had mine for almost 5 years now.
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