By far one of the most aggressive and SMART fish I've ever owned. Had one for 3+ years (until total tank crash from bad ich outbreak) in a FOWLR tank with triggers, angels, tangs, puffers. It was one of the first fish I bought when I restarted the hobby 6 years ago, thought it would be cute and cuddly based on size but quickly realized I couldn't add anything new to the tank without it being viciously harassed. So when I started adding new tanks I put it in my FOWLR, one of the first fish in there, and even tho it was only maybe 2", it harassed everything else that went in, Humu trigger, blueline trigger, Flagfin Angel, dogface puffer, lionfish, and more, and everyone of these fish were easily double the dotty's size, it had no fear. It would dart in and out of rocks attacking from all angles and then disappearing. Hope yours are nice, sweet fish, just gnarly mean.