By allowing mixed marriages with colour forms of Platies, the aquarist is only undoing the results of years of patient selective breeding. The serious aquarist ... On no account should female Platies be moved just before they give birth, but should be put into breeding quarters well beforehand. ... The feeding of Platies is quite easy, and they will readily take prepared dried foods from birth. With the ... Young Platies grow rapidly when well fed, and at six weeks should be about 1 in. long.