Fish in 150 gallon tank

I have a 150 gallon tank and I'm just wanting some advise and opinions of how many fish I can have in my 150 gal tank. So far I have a Achilles tang 6"/ hippo tang 3"/2 damsels 2" each\ 2 clowns 3" and 2"/ pink dotty back 3" and some snails crabs and one cleaner shrimp. I also have a cheveron tang coming in. I just want to know what you guys think. I might remove my blue hippo later when it gets larger bc I heard they get about 1'. Please any advise thank you