Since I began keeping them I have kept all of the common CA and SA fish you see in stores. About the only CA's I haven't kept at one time or another are the very rare (a lot more of these 'rare' fish available nowadays) or the very large, just never had the tank space. I've had a few of the larger guapote species, but only for a relatively short time. Sell 'em or trade 'em off when they get around the 5-6" mark before they get too cramped.