Have any of you out there used these before?
They're designed to keep the surface of the substrate free of contaminates and look dead easy to make. I'd hook it to a canister rather than have an internal pwr head, but that's JMO.
I was thinking they could prove valuable in eliminating dead spots in the tank and a good way to distibute CO2 enriched water in amongst the planted areas at the ground level.
I'd appreciate your thoughts and experiences.

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