whats in the tank other than the guppy fry?
2 female guppies, the mother fish, they didn't fight each other, they swim together
But can't they hide in the fake log and under the log and in the marbles?
You might have a few survive, there is no guarantee though.
Umm they will usually hide in the gravel plants and log. If you had hornwort you would more likely have more survive
They will need to come out to eat, and the adults will mistake them for food or not even care that they aren't food
Also they could find food that falls near them. I would put a sinking wafer down every night, so they can get some food at night