I get what your saying about it draining alot of water when I turn the pump off. to clarify, this is not the overflow, but the return pipe pushing water into the tank, so I dont think it needs to maintain a siphon like an overflow does?
i plan on drilling the tank with a glass holes kit.
Ah, I see that you posted it was a return now. You don't have to worry about it losing siphon in that case. I would raise it up though, and change out those metal clamps. They sell plastic ones as well. Those are the clamps you want.