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Here's a how-to video on connecting the Octo Varios Pumps to your GHL Profilux by using the Breakout Box. The 0-10V control allows for a lot more flexibility in controlling your DC powered return pump.
Link to the 0-10 Cable I used:
www.bulkreefsupply.com/altern...
Link to the GHL breakout box:
www.aquariumcomputer.com/usa/...