What size are these 4ft tanks you plan using? James knows his tropheus behavior pretty well. I would take his advice.
JamesRiggs;2337212; said:It is actually PROVEN that they breed better in a 6ft tank, check with the best breeders and importers and ask what they keep theirs in, a 4ft 90 gallon or a 4ft 120 gallon would be sufficient long term for a colony of 20-25 fish but a smaller tank is not, 12 is not a good enough size colony, that is the BARE minimum to spread the agression.