let's see, in my 75, i have koles tang(friendlier, smaller and heartier tan most others), 4 green chromis, pair of perculas, pair of fisrefish, a bengaii, a blue gudgeon goby and a scooter blenny and an algae blenny, if i were to do it over, i might get a convict tang instead of the koles(i like both and i would take either), and instead of the bengaii cardinal, i would get a different fish, because we had 2 and one died and don't want to add another because they will probably fight(pairs are great but don't add one after the other) probably a smaller wrasse, because of the color, AND i would get a royal gramma (they are so coooool) instead of the blue gudgeon, as for the angel or dwarf angels they are more often than not reef safe(only the cb or flame almost all others ARE coral munchers) but have a good chance of being coral munchers(i just don't like the odds), now a 75 and 90 are very close in size, same footprint with a couple more inches in height
and for rock i would get at least 1.5 lbs per gallon, my 75 has 110 lbs give or take 5