I've been offered a friend's African cichlids when he moves (in about 2 months so I have time to cycle a tank). He doesn't know what species they are - looking at them I think they might be different varieties of Labidochromis, some yellow, some black and white, ect. He has around 8 of them plus a huge pleco in a 30 gallon tank. This seems a little crowded plus I only have a 20 gallon to keep them in, so I know I can't take them all. But what would be a realistic number to keep? Would four or five work out?