Just wondering about fry...?

I don't think the home made shelter will do much good for the fry. I have a shelter/dugout made from a clay planter pot that i broke in half. i have the noticed that my guppy fry will hang out near the outside, but never go in. They pretty much just stick to the plants. on the other hand. My Cory cats and other adult fish love it, so i figure the time they spend hiding in there, the less time they might be eating my fry. For fry, the best thing is a dense section of plants, live or plastic. This is however my own observation.