56,1 as in 561 gallons?
Lots of options there. I like tangs because they don't eat corals, they swim a lot, and will make short work of most algae. Just be mindful of the tangs you select; a powder blue and a powder brown may not get along. If I put a mirror in front of my tank, the naso goes ballistic!!
Lots of small fish would be really nice.
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