yeah well the guppies will need to be kept in a separate tank, a 10g is adequate and just plant it with lots of plants (real or fake, doesnt matter) for the babies to hide in and then just feed and wait, you will be overflowing with guppies in no time, i personally however dont like having to set up an entirely different tank that i have to upkeep just for food so i just feed things like worms, mealworms, crickets, grasshoppers and then frozen stuff like raw shrimp, etc