okay listen you have a 75 gal
tank. That is pretty big. My friend had one and he had at least 2 or 3 emeralds, 15 scarlet hermits and 15 blue leg hermits also about 4 or 5 turbos and even an algae blenny which helped with that. you do have a very nice array of fish in there which is awesome but you do need a nice clean up crew to clean up their mess. also 4 or 5 astrea snails are great i have a couple in my tank and they do work wonders i will say that.
as for the star fish, these guys are right in letting your tank mature before you add them if you have sand then i would recommend sand sifting stars which help get rid of fish waste that settles on the bottom of the tank
if you do have any problems with an over growth of algae since the tank is new i would recommend a flame-tail blenny. I had my troubles with algae and ive had this fish for a lil over a month and it really does eat that stuff up. Just a thought
Hope your tank flourishes like it should