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I would not add fish. Even in a 72" tank I like 5 species. Some squeeze 7 species in a 72" tank.
Also I have never had luck with less than 4 females...especially with aggressive species like socolofi and Metriaclima (cobalt),
I do not find extra filtration or rocks increases the capacity for stock.
With the fish you have, as long as you end up with 1m of each aggression should be managed very well. Too much overstocking gives you a tank like those feeder goldfish tanks.
Also I have never had luck with less than 4 females...especially with aggressive species like socolofi and Metriaclima (cobalt),
I do not find extra filtration or rocks increases the capacity for stock.
With the fish you have, as long as you end up with 1m of each aggression should be managed very well. Too much overstocking gives you a tank like those feeder goldfish tanks.