i dont have another tank, so a breeding trap is my only option for saving the fry. How do you tell when to put them in the trap?
also, i have a (i think) pregnant platy. i posted about her before and some suggestions were overfeeding, but after cutting her food back alot she hasnt changed and still has a dark gravid spot.
how long can platys hold on for before dropping, as she has had a dark gravid spot for about 5 weeks?
thanks
Another thing you asked was about the gravid spots, this is not a good rule of thumb because they are decivers.Many gravid spots are just natural coloring.This causeing some new fish keeping hobbiest to think that there fish are pregnant when in reality they aren't I always look for the squareing off, there are pinned topics in this livebearers section that will help you with determining if there pregnant or not, and if you can't tell feel free to post a picture of them and we will give you feedback.

Also you asked how long will it takes platys to drop, it depends on the age, and some would say tempature of the tank, but just focus on this, usally the average platy gestation period (time of fry in the mother) lasts around 4 weeks but not rare for it to last into a 5th week