I agree with the replies above. You may want to consider adding more geos, if you have plans for an upgrade as your stock grows. What kind of substrate do you have?
My group of 5 red heads chase each other quite often. However, I wouldn't consider them aggressive at all. There are never injuries, or even split fins. I'd compare their behavior to kids teasing each other. They are best kept in groups of 4-6 or more. The geo's tankmates are pairs of Hypselacara Temporalis, Bujurquina, Australoheros Paraiba and an L240 in a 110g planted tank with driftwood. For a cichlid tank its actually quite peaceful. Their shoal is well formed with a definite hierarchy. Sizes are between 3.5 to 5 or so inches. They really do make a nice looking group.
When theyre not trying to uproot plants, they spend most of the day sifting the substrate (sand and eco-complete). It keeps them VERY occupied
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