in the long run, i am thinking of 1 severum, 1 chocolate, 1 firemouth ( got a firemouth with my africans right now, about the same size as the chocolate/severums, and he gets along great with the africans ) so would a 75 be big enough for one severum, one chocolate, one firemouth?
Severum are generally pretty calm for a large cichlid. Not 100% sure about chocolates, but I hear they are also pretty mellow. A firemouth would probably be okay to add to a 75 (though I would recommend a 90+). You would definitely want watch for aggression and either upgrade or rehome someone if things get too rough. Also try to get them all around the same size and grow them out together (the firemouth should start just a bit smaller than the other two as they do grow a little faster). Fish tend to display less aggression to other fish they know and have interacted for long periods of time.
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