I was going to attempt making one of them then I came across the SCWD at JL Aquatics for 55 bucks. It has been running for 3 weeks now and the fish seem to like the alternating current (they seem to be surfing across the tank with smiles on their faces) and the corals are swaying nicely, no more powerheads in the tank to cycle, it makes no noise. It was the best money I have spent on the tank and it was easy to hook up. Just another option for you.
Good luck,
Kelly
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