The toadlet will be fine burried. Mine do it and come out at night to eat from the small dish they have, plus I have red runners roaming in the tank also since they LOVE to hunt them down. Some times it seems like they are staying down for days, but none of them are thin so I take that as they are doing fine. Plus I find tons of poop in the morning that I clean daily from the tank. I don't feed crickets since the crickets can bite the toads when they are resting or partially buried in the substrate. I also started to feed wax worms, but just a few a week, they are high in fat.