I used to have the same set up. 2 clowns the angel and 2 damsels and 2 fire fish with a lawnmore blenny and they all got along great.
So IMO they should do just fine.
A 75 is on the smaller side for a tang (no really, they can grow pretty large), but a smaller yellow should be happy for quite a while in a tank that size (that isn't stuffed to the hilt with live rock).
I had a yellow tang in a 55 for 5 years. It all depends, IMHO, on the size of the tang. Start out with a small one - quarter to half dollar size. You should be fine for a number of years. Don't forget to feed it nori or Seaweed Selects on a daily basis.