I recently bought 2 black convict cichlids I believe they are both female they are in a tank with two young oscars its a 55g tank and yes I know I need bigger but water parameters are a lil off my tank went through a second cycle I ditched carbon and got a lot of ceramic bio Max but the problem I have been having is my convicts change colors most the smaller female not to sure if its normal she goes pale the seconds later she's colorful again I have a very light crushed coral substrate dark plants some dark slate rocks and caves water temp is a constant 77 degrees. So what could be the cause? Any ideas or suggestions is greatly appreciated. Also found out that there is ich in the tank on a diff fish what's best to clear it up I know it go through cycles and at points is immune to chems