Sorry, definitely no tangs in a 28. They grow fast and even if you buy them at nickel size they tend to get stressed out and get ick. The dwarf angels have lots of color and I think the smaller kinds would be OK in your tank but they are hit or miss on reef safeness. Mine only bothered Pocillopora. As long as you don't want shrimp a flame hawkfish would be pretty. There are lots of reef safe wrasses that would be OK too.
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