just leave it in there. add some floaters for it to hide in. it's a white cloud fry, a day or two old. they start swimming at 3 days. nothing needs to happen for them to breed, they just do. i suppose the guppy may eat it but there will probably be more. mine will have two or three fry survive from each batch when left in the main tank or twenty to fifty if i put them in the breeding tank. mine tend to 'hide' on the silicone.