Okay. I really wanted to keep a small group of Geos. I was even thinking about omitting the EBAs for the Geos to make the tank less crowded. I couldn't go beyond 4 feet tank in my apartment. I think I have to reconsider about them.
I don't have sufficient space for a 6 feet tank. Currently I am planing for a 100 gallon tank (4.5' L / 2' H / 1.5' W) in place of 90. 4.5 feet is the max size I can go for.I think geos can be kept with the said species, however I agree on the fact that you would need a 6ft tank. I had my red head tapajo in a 3 or 4 foot long tank and he was a big bully. Now upgraded into my 150 he is a lot more peaceful. I should also add that in the 150 there is quite a bit more flow.
I will look into these species and will check if they are available here. Most of the SA cichlids available in India come from local fish farms. There are only a few reputed importers and breeders in each city who sell fishes of good blood line. So, the availability of SA cichlids is a big issue here except for Discus and Angelfish.Many of the Gymnogeophagus are smaller, and would work well in a 90 gal.
They will require a bit of a winter cool down, and the denosoni barbs would work in that environment, because they also appreciate cooler temps.
Here are a few I've kept. I kept them without heaters)
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Above Gtmnogeophagus gymnogenys Rio Yesrbalito, males are the most colorful, and high profile.
Below Gymnogeophagis sp. Paso Pache, again females are smaller and less colorful
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Below Gymnogeophagus balzani, females smaller, and no real hump
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I have kept all the above will cool and temperate water cory's like C erhardti, and Uruguayan and Argentine tetras , like Buenos Aires tetras.
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Below, winter cool down temps, but summer temps in the low 80s work fine
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