Originally Posted by kdpuffer
A kole tang would likely be ok in your tank provided its a 4 foot 55 and you want to have an open scape as they swim alot. You will also want to cut back on your stock list or you may have your water fowl up quickly which can be bad news with tangs as they are sensitive. I'm sure someone will chime in here and criticize me for saying the kole is ok so here's an explanation as to why I say so. Tangs swim the length of the tank they don't swim as much up and down. Therefore a tang suited for a 75g or 90g would be fine in a 55g that is 4 feet long because it's basically the same tank just shorter and a little narrower front to back which is negligable if you scape your tank to allow the fish to swim around and past your rock. The main concern at this point is water conditions, with having a sump you add water volume which adds stability. After rock displacing water you are going to be very close in volume to a non sumped 75. As long as you keep your water in check you should be fine, this could be helped by reducing your stock list. Personally in my 55g my list will be a bicolor blennie, pair of oscelleris clowns, kole tang and I may add a purple firefish depending on how parameters sit.
Thanks for the advice... I knew id have to cut back the stocklist i just wasnt sure of the dish i wanted to pass on so far it looks like ill defently be passing on the hawk fish