I have 2 different types of OB peacocks, Rusty's,Red top Cobalt Zebra's, Yellow tail Acei's, Pseudotropheus Elongatus, Yellow labs, in a 80 extra tall tank. Now I have the 2 types of peacocks spawning and the elongatus spawning also in that tank. I think I have around 28 to 33 fish total in the tank, there all around 2" to 5" in size and no aggression problems.