So I was halfway through my fishless cycle on my new 55 gallon dirted planted tank, when I found snails. So I'm tearing it down and starting all over. I was using organic potting soil, but honestly it's been more trouble than it's worth. So now I'm looking for a good, cheap aquasoil. Does anyone have any suggestions? I intend to cap it with small gravel, sloping up in one corner to make a sort of "hill".