I was in Home Depot and found a clear vinyl tubing which I thought would make an awesome tunnel, but the guy I talked to didn't know if it would release toxins submerged in a fish tank. The tubing is oval, 1 3/4" H and 1" W. I wanted to only get 6 inches to go in a corner because it has a slight curve to it. (Sort of a shortcut around a corner and hide it with some "floppy plants".)
Any comments on the use of a vinyl tubing and possible toxins? Thanks.