yeah that why i said 50 haps and peacocks in a 150 is WAY too much imo. and if that rule was even true about 15 mbunas in a 55 than with a 150 you should only have about 40 mbunas and the haps need alot more swimming space so i would say max at 20 small haps and peacocks or something around there...but 50 full grown? i dont think so