I do apologize for butting in, but this is the first time I've heard a mimic tang being extra aggressive (although wouldn't be surprised, they're still tangs). Just to clarify things, when you say aggressive, apart from the fact that it harasses newcomers, does it also chase down the bigger achilles and PBT? What's the size of the Achilles, PBT and the mimic?
Achillies and powder blue are about 5-6 inches. He doesn’t mess with them. He goes after any fish smaller than he is though. He’s really not a fan of my regal angels. I’ll more than likely pull him at some point because I assume it will get worse as he grows.