juvenile purple and yellow tang (for as long as I can), sand sifting goby, 2 clowns, orchid dottyback, damsel. I have everything but the tangs and goby now in QT. I figure the tangs will be QT'd and added together after other fish have been in for 30 days to prevent aggression. I imagine I'd like a few more down the road (I always wanted a goby pistol shrimp pair). I want room for them to swim around but you may be right about hiding places...I've never had more than a couple of fish so Im really not experienced with them. I figured as 2 tangs are iffy in a 75 better to leave them more room to swim. Now Im concerned about hiding as well.What sort of fish are you thinking of? It could be a bit low on hiding spots for some types.