hi i tried and successfully made a colony from 4 tropheus in a span of about 6 months i think... just by accident though, i put them in a pond together with my 5-7inches front colony, they were about 2in in size then, saw the first brood 3 months after.. there are around 50+ in the pond now, just can't get an exact number due to my ponds size... i've also relocated may fronts to lessen the chance of the fry's getting eaten.