They paired up i presume?
I would use the 25 gallon for the fry.
When removing the fry once free swimming, python them out of the adults tank (like you would doing tank maintenance). Specialist liquid foods can be bought for fry from your local fish store. As they get bigger, brine shrimp and finely crushed fish flakes.
Also, i would suggest having java moss (or other plants like it) in the fry tank, as they have tiny food sources or something like that.
Oh and remember, either cover up the filter intake; or even better, use a sponge filter.
Have I missed anything?