I have a 20 gallon tank that I planned on putting 2 female convict cichlids in. The thing is my pH is 8.4. I was thinking I would instead go with a type of African cichlid because they prefer hard water. Could someone please suggest to me African cichlids that can life in a 20 gallon? The more the merrier. Also please a type of cichlid that I can actually find in a fish store. Please and thank you!