I have 3 easy planters in my aquarium for about a month now with cripts in them. I put root tabs in the little pot like Cory showed in one of his videos, and I have a sand substrate. Every time I do a water change there is a pocket of air that builds up under the planters. Even had it build up enough once to flip one of the plants over, I wouldn't have believed it if I didn't see it happen. The pocket of air smalls bad too. Should I drill a small hole so that won't build up?