I was at Petsmart today and was looking at their Pseudotropheus crabro and they had about 5 of the normal yellow and brownish stripped ones and then there was one that was almost all black. it had a little bit of goldish brown on it but it was basically all black. I know they can change colors but do they do that in the fish tank if theres no catfish in sight? At first I thought it was just a male but it seems like the males and females look the same from the species articles. Does anyone have them and know why this might be. Has anyone seen one like that before?