Tank mates with my Senegal

I have a small Senegal with a small sevrum in a 75 gal. There is plenty of hiding space, and adequate filtration. Could I keep an electric blue acara, a keyhole cichlid, and some Congo tetras with them? Or would that be too much for a 75? If the congos are too much is there anything else you would reccomend with the keyhole and acara?