Ya, but, the CLS is well below the water line as well. I thought about this for some time and the idea was to move the water from the bottom of the tank upward and out the overflow. The water surface has really good motion and oxygen levels are always good, and dead spot a minimal, for a DSB. The idea works well, just got to make sure the valves due. There are two of them, and I consider checking the rubber seals and or having to replace the valves, part of the maintenace of the tank.
By no means was this my idea, nor would i take credit for it,right or wrong, I saw it in a tank online from a guy in the UK and also in a tank in Winnipeg.
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