I have a one gal (yeah, 1) with a sand bottom and a LOT of plants, I take the eggs out of the main tank and just drop them in there.
In about 5 or so days, they hatch to tiny little fry. They will eat the little critters on the plants, and they will eat powderized flake food.
A tiny pinch, and swish the surface so it floats down to the sand.
it takes a few weeks for them to grow up to a noticeable size, and a few more weeks to get to about 1/4 inch long.
I suck them up at that point with a turkey baster, and put them in a larger planted tank to grow up big enough to join the big tank.
You can toss the 1/4 babies into the main tank if it has lots and lots of plants and places for them to hide out.
once they get about 1/2 long they start to school with the rest of the adults