Polyethylene tubing at Lowe's is good and dirt cheap. The catch is its just available in foggy clear color and its stiff. Think its like 8 cents a foot. If you cant see it then it works great. If its going in the tank you can switch to a more expensive better looking tubbing once it hits the water.
So what would happen if I was to use regular aquarium airline tubing? Does it create some kind of chemical reaction that's harmful for the fish, or will it just wear out more quickly and need to be replaced?