Hey Symbiosis I had done that originally with my 30 gal reef. Let's just say it was on there for a month before I went to the store and picked up a real overflow. The problem with the setup you are doing is that it'll be very difficult to match the flow between the return pump and the pump that is sending water to the fuge. Not to say it can't be done. I had it operational for a month. The reason I switched is because you have to constantly fiddle with the flow of both pumps as any change in the diameter of the hose will affect the flow. (i.e. Algae, or buildup with-in the plumbing.)
My suggestion is go to a LFS and see if they have an used overflow that they can let go cheap. (I've got 2 from mine for free)
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Photo anyone?
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