I was recently in a similar situation. I setup a 10 gallon bare bottom tank cause I had one sitting around and just filled it half way. I had a clump a subswassertang(probably not spelled correctly) that I put in there with them.
if you have the 10 setup and running already and there aren’t any larger fish to snack on the fry I would put the cory fry in there as well. Maybe just have to feed a little more to get food past the guppy fry.
My spawn wasn’t 60 I only had a dozen or so. I put them in the display once they hit 1/2 inch. I fed baby brine, the coop fry food, and hikari first bites.