Aggressive Clown Tang finally leaving most of my fish alone after 4 months. 

Mirrors work on EVERY fish I have but does not confuse the clown tang,he knows it’s just a mirror.

If you just got a powder blue he may pick on the clown tang as mine did last year,he wouldn’t let the clown tang near any food.both fish are territorial but the powder blue is till the death focusing on one fish to pick on and the clown tang is too busy eating and picking on every fish to actually kill another fish intentionally as the powder blue will intentionally kill another fish.