Hi. Sorry to be the bearer of bad news but a tang is way way too big and active to go into a 75g. Most require at least a 6 foot tank. The naso is actually too big for my 125g tank! LOL
You have alot of options for fish, just not tangs unfortunately. :-(
Are you going to do a reef tank or fish only? That will also dictate what you can keep.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.