the walls are mesh right? so that water and warmth can flow threw cause if not fishys on one side too hot and other side too cold..
also do the tanks have lids? cause bettas are jumpers and its never good to come home to dried out fishy on the floor
. and the breeding tank will need a tight fitting lid,, babys under 3 weeks old are very very delicate ,, they laberinth organ is just being formed and they need hot moist air to breath,, a cold dry draft can kill them and they sprint up to the top for a gulp of air , i sometimes wrap saran wrap on top of a lid to ensure good humity,, you have it right when condensation drips down the sides of the tank,, and when the babies are less then 3 weeks old try to lift the lid as little as possible to keep them warm
any plans on what to feed them right as they hatch,, most babys will only eat live food at first,, microworms ,vinigar ells, i feed wardlys liquid food for ther forst week then on to baby brine shrimp and powdered beta food. and then daphnia frozen, then adult brineshrimp , frozen < well thawed out first of course!!!
going right to baby brine shrimp weeds out the very smallest fry cause they arent big enough to eat them, and will cut down on fry numbers, but having 50 to 30 babies is alot to handle at a time any way..
do you have a bigger tank for a grow out tank? cause 10 probally isnt enough to hold more than 10 fry to 3 months,,, the bigger the tank then less aggresion and the later yiou can usually wait to have to start jarring out the boys,, what are you going to use for jarring and how arew you gonna keep them and keep them warm, some people uses heat mats but that not ecomomical for large baches of fry,, i just heep my fish in a side room with its own heater,,
at any rate babies are alot of work lol!!!good luck!!