Hi there, I am the advocate of 'size matters', size of the fish that is. Curently I have a Purple Tang and a Sailfin Tang along with a Maroon, Foxface, Flagfin, and Azuri Damsel in a 55g.;I think the purple tang is beautiful, and i want one. I have a 90 gallon aquarium 4 feet long. 3 blue devil damsels, and one clownfish. i plan on getting a few more fish before the tang, so he can be the close to the last if not the last addition to the tank. any thoughts ???