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I don't know much about the cichlids, but the rts and the ruby shark are both going to become aggressive as they mature. That's they only thing I can really see wrong with the stock list. A lot of hiding spots will help to cut down on the aggression.
Actually I think 3-4 Bolivian rams would be better.So to summarize it all;In a 75 gallon:^ zebra danios,1 red tail shark, 1 rainbow shark,2 keyhole cichlids, 3-4 bolivian rams,And 3 rams.
Are you aware of the whole cycling process, considering you don't have the tank but want to know what fish to get? Its not just a add water and fish kinda thing....