i have 4 yellow labs imo 3 f and 1 m and also i have 2 blue johanni Melanochromis Cyaneorhabdos and i wish to breed them.they are about 1.5"-2".i think they are in breeding size.i want to know how to sex blue johanni and yellow labs.one of my blue johanni is very darkly coloured and other is slight fader both have 1 egg spots and always keep chasing each other and rotating and colourful one doing forcefull lip locks so i think it is a pair but am i correct please tell me.my labs are also chasing each other but not breeding yet.I wish to know if both johanni are male or both are female,can they breed with yellow labs as both of the species are mouthbrooders.so,please suggest me how can i induce breeding them or trigger breeding in them.I do water changes every 2-4 days and have temp. of 28-30 degree celsius as it is breeding temperature and sometimes giving them a bloodworm meal.so,plz tell me what else can i do to make them in mood
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thanks a lot

thanks a lot