Never had johanni, I raised Melanochromis vermivorous. Most fish in this genus are pretty similar. Like auratus, they are aggressive, so I agree with 35, try to keep a harem. If your tank is on the small side, the fish will eliminate the extra males for you. Remove any you find hiding in plants with no fins before they get killed. I think they start to breed around 3", but I haven't kept this particular fish. The ones with dark edges on the fins are more likely males. It looks like your tank has lots of hiding places, but you can't have too many for a fish like this.
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