hey chef you can do the fox w the corals, I have done it before in my 28g and now that fox is doing great in Seans 120g w plenty of corals. I agree w every one else,I would stay away from the triggers, as appealing as they are. Also beore you put the mithrax in the 75, I would consider removing them, I caught those boogers picking their lunch away w my corals, just a heads up!!