I do like the idea of having a pistol shrimp goby pair, i have heard that the pistol shrimp will bury any corals on the sand and have also been known to drag frags down into their caves. I don't know why but i love the kole tangs, i know a lot of people say they are not the most attractivetang but i love them probably my favorite tang. Do you guys think the kole will be fine in the 75 i do not plan on upgrading anytime soon and i would not want to have to take him out if he gets to big. So will the kole be fine in this tank his whole life.