On a related note...
1. There was some recent reef central discussion on eductors, essentially a pump forces water into a tapering nozzle, the increase in flow velocity through the tapered nozzle brings in water from the sides much like a venturi works. I am wondering if anyone has tried adding a small eductor onto a powerhead.
2. I wonder whether flow would be better if, rather than just a powerhead, the intake of the powerhead was from some pipe/tubing 2 or 3 feet long, besides just flow from the powerhead would this not add to overall tank circulation by moving water from point A to point B better?
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