I have a powder brown like the fish pictured above, also known as a whitecheek. I had to recently remove it from my 180 after adding a mysteri wrasse. He has been residing in my refuge for the last three weeks. i love the fish, it is gorgeous, but they are ich magnets and can be very aggressive towards other fish, even those not in the same family. I think to ensure their health they should be housed in a large (250+) tank so that they get plenty of swim room. Regretfully I will most likely return my PBT to my LFS.