What I mean is, does a snail need open air space at the top of the tank? I wish I could remember the site, but I read somewhere that if snail doesn't have an inch or two of space above the water line, it will stress out and die. I have provided this for a mystery snail that I have in a 5 gal, with a pair of adf's, but the snail spends all of its time below the water line, and the current made by the bio wheel is like a waterfall, so I would rather fill the tank if it's not really necessary.
Thanks in advance,
Chris
Thanks in advance,
Chris