If you can, catch them with a net and separate them. If you found two, there will likely be more so keep an eye out. If you don't have a separate tank or floating container, you will want to make sure there are hiding spots for the fry so that they have less of a change of being eaten by the parents (or other fish in the tank). Mosses and bushy plants will work well. I would let some fake plants float on the surface, because fry usually like to hide there. As for food, crushed up (into a powder) flakes will be fine. If you do separate them, I would wait until they are at least .75 inch in size so that they other fish will probably not eat them.