With angels it depends what kind you would like to house and what corals you have. I'm not a big fan of damsels myself just because most I've seen are very agressive and tough to get out of the tank. As for the number of fish in the tank it really depends on the size of the fish some say 1 gal per inch of fish but I think thats off.... I know this is a bit vague but give us some details on what your plans are for the tank and what types of fish you had in mind.
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