yes! i just did my weekly water change and found that as i was vacuming the gravel 20+ snail popped up! then when i was putting all my decor back in the tank after i finished vacuming the gravel, i found that the adult snail had been in the cave the entire time. so i quickly put it into my tank, and although it had been out of the water for a while, it seems fine now. it isn't moving very much, but it is moving so it seems to me that it is recovering very nicely. i didn't know that baby snails hid under the gravel, but i'm glad that i was able to find them. =]