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Just got a Hex aquarium from an uncle. Not sure how big it is, though. Just wondering is it possible to put a ciclid or pair in it or would a hex be a bit too confining.
Rich is dead on. If it's a moderately small tank (20 gallons) you could easily have a pair of shellies (smaller Tanganyikan cichlid). Unless the tank is very large you'll never be able to have a large stocking density, or variety of cichlids because of the lack of distance to set up territories, but single breeding pairs tend to be much better about fighting over space.