Don't think that a closed loop guarantees you can plump low and not have your tank drain. At least I would not build my tank that way. Ever had a pump lose a seal or malfunction, I have. On a closed loop with low plumbing I would have drained my entire tank to the floor. IMO it is just a risk having the plumping to low. On my new tank it is drilled high on the back and returns and outlets take a 90 degree bend downwards to what level I want. At the 90 I have the small little holes drilled to break the siphon. I never want to see 340g. on my floor. (knocking on wood)
Dave
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