So, my 20 gallon is supposed to be a South American/Amazon tank, and right now all I pretty much have are tetras and 1 GBR. I would like to get a male GBR to form a breeding pair and another type of dwarf cichlid for my tank, preferably some sort of Apistogramma. The cheapest ones I can find are the "Assorted Apistogramma" on liveaquaria.com, and I might get one of those. The only thing is, would the GBRs and the apisto fight? The tank is a long tank, and I heard on another website that it shouldn't be a problem since the apisto and the rams would each have one square foot of territory (Tank measurements are 30 in. x 12 in.). Also, does anyone know what species I could get from buying one assorted apistogramma? Thanks