My Red Zebra & Pseudotropheus demasoni grow out tank: 10 red zebras and about two dozen demasoni all just under 2". Needless to say it's a pretty dynamic tank. The red zebras were born in July 05, & the demasoni are a consolidation of 4 batches of fry born between May-Jun 05. Aggressive traits developed early with these fish and the largest demasoni seems to be the most dominant as no fish chases it. The fathers of these juveniles were posted earlier.(kay-bee19)