Back when I was new to cichlids,I had an 'expert' at my lfs tell me that a red devil, an oscar, a green terror AND a chocolate cichlid would be fine for life and compatible in a 50g, 3ft tank. I got the oscar and RD, and 15min after they are put in the tank together, I have a nearly dead oscar. Needless to say I put them in separate tanks and found them both new homes as soon as I could. I still bought fish from them, but I made sure to do my own research. I have heard (and been told) some epic mistruths about fish in the past by various lfs'.