Advice on fish only tank!?

I have a 90 gallon tank I am building a stand for now. I want to do a fish only tank (triggers, eels, lionfish etc....)

This will be my first FOWLR (I'm guessing that the right acronym) and only my second saltwater (90 gal reef that is doing good 2 months old).

And would like any feedback at all will be extremely greatly appreciated

Thank you