I don't have personal experience but the consensus seems to be that they won't do well with other Geos... at least not those outside of the brasiliensis complex.
i had 5 brasiliensis in a 110 when they were 3" apiece and they were with full grown pair of oscars and other miscilaneous cichlids. they did more than hold there own so i wouldnt bet on it. plus they get bigger.
i have one with 3 pelligrini and 1 topoja.rays. n rays. no problems he is the biggest in the tank. got him with the other geos off some one already big so idk but it works for me
I have a surinamensis with my brasiliensis and they get along great, actually. I've never had a problem. Although my brasiliensis is only about 3-4 inches and my surinamensis is probably around 5-7 inches. They're pretty much inseparable..
I had my G. Brasil with to 2 G. Abalios and 3 S. Leucostica without any issues. But yes
can be a little more aggro than typical eartheaters. So it is a crapshoot with the individual
Brazil personality wise.