HELP FISH TURNING BLACK
Hi I am new to taking care of Cichlids, I have 4 African and one tiger Oscar in a 75 Gallon Tank. They have all been content with one another, and all have there own territory. They also do the usual chasing each other once in a while. But not a whole lot. I recently noticed my yellow and black striped cichlid (Dave) has turned more black with a little hint of blue? I'm not sure on it's sex/gender but did not know if this was normal? What should I do different and or is there something wrong with my tank? Thanks to anyone who responds!