I have a 3'' clown tang in my 225g tank, it is the meanest fish, when it comes to tangs.. I had one in my old 90g tank with 2 other tangs and never had any issues... This one has already killed 2 naso's, a powder brown and a blue tang.. I no longer will add any tangs to my tank because I know what will happen... I tried to remove him but after 2 hours, he is way to fast, I began getting stressed and knocking rocks over and corals. Just thought, I'd share.. anyone else experience this?