i have 6week and 4 day old betta fry and when should i separate them coz there is abit of fighting going on but not yet ripping fins and i can tell the sexes.
3 months isn't a hard and true number, it all depends on when your fish are maturing. I have a 2 month old spawn and I've had to seperate out several of them already. So watch your fish, if you see damage being done, seperate out the aggressors.