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I've got clowns, firefish, wrasse, and tangs; although the tangs will eventually outgrow the 55g. I'm considering a goby or blenny and a cleaner shrimp too.
Unfortunately they require a bigger tank. Most recommend a 6 foot tank. You could add fire fish, gobies, clowns, blennies, some wrasses cardinal fish etc.
i suggest the same as the others, blennies, gobies, clowns, maybe a wrasse...are you going to have corals?
And yes, almost every tang requires a 6 foot tank. There are a few others that dont like kole tangs and tomini's they can do well in a 75g or bigger though
Choose one fish and build your stock list around it.
I have a 55 and I have a lawn mower blenny, a clown, flasher wrasse and a royal gamma I also consider it completely stocked. I wanted a royal gamma and I built my stock list from that.
If you plan on a reef tank don't get an angel fish they aren't worth the risk. Don't get a fish thinking you will upgrade someday and you will have time to do it some fish need the zoom room from the beginning.