What I'd look at doing, is, instead of a 90-degree elbow behind the bulkhead for each return, is have a sideways "T", and continue the piping upwards until it reaches a point above the water surface. Then I'd cap it off. Problem now to solve is, because your piping is outside of your tank, you can't drill a hole and have it serve as your siphon break because it will have a small volume of water coming out. What I'd look at doing then, is basically have a small diameter pipe (or better yet, some 1/4" tubing) that continues on and drains into your tank, sump, or overflow. As long as the output of this tubing is above the waterline it will serve as your siphon break when your sump return is powered down.
Or .. you could just use your existing holes for a closed loop instead of a sump return, and have your sump return still go over the tank edge (which gives you an option to drill your siphon break hole anywhere you like).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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