Well it depends on what kind of fish you want to keep. The big Triggers, lions, Parrots etc. eat lots and are usually messy eaters so it is important to have plenty of live rock and skim the heck out of the tank all in perportion to how many/how big your fish are.
IMO you could easily do a FOWLR in your 75 you will just have to manage your bioload and fish number/size.
I would also highly recommend that you have a sump/fuge to house a larger skimmer and other equipment.
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