On Mar 12, 6:27*pm, "DEM" u42059@uwe wrote:
i have 37 redwag platy fry... i need help to know when a good time to take
them out of the breeder would be .
when would i determan the sex?
any one who is willing to help me out is alsome...

Hard to say aon sex but you may be able to tell if you use a
magnifying glass as the male is already developed in that area right
from birth. Its easy to tellem apart so check em with a magnifying
glass. I would put those 37 fry in their own tank as a breeder is too
small and not really designed for raising up fry, as much as they are
for providing an area you can collect the fry and help prevent
canibalism by the female parent.