The males each claim a space of 24" where they let no other males in regardless of collection point. Because its only the females that school what you'd have is 3 or 4 trophs claiming the ground space while the others get constantly beat up. Some males won't even tolerate another male within the confines of a 75 gallon. There's a thread in the Tropheus section answering a similar question. Another problem I would see arising is that there are significant size differences across the Tropheus genus and even in the different collection points. The larger fish would just punish the smaller individuals. You could always try it and it may work out, but its difficult to buy a single fish, and the single trophs you see for sale are always problem males.Mr Mbuna said:I mean no females, just one of each male from a range of variants just to show the range of colours available within the Tropheus genus. With no females i can't see why it wouldn't work.