im getting my live rock from someone so i dont mind having it all live

if i cut down my clean up crew to say this

2 cleaner shrimp
1 tuxedo urchin
2- Astrea snails(or diff kind of snails)
5 mixed crabs
1 emerald crab
1 algae blenny

that would work?

I'd go with less rock & sand. I'd also cover the tank. I've had firefish, wrasses & clowns jump from mine.

I'd add several nassarius snails and a few cerith snails too.

IMO I would not put a blue tang or sailfin in a 90g. I think they get too large for a 90g. I'd stick with one of the bristletooth tangs or the yellow tang.