Well, stuck the co2 tubing into the inlet of the Tunze return pump and so far the results have been very positive. I see a very slight influx of bubbles every couple seconds from the return pump, no noise and my ph has dropped at least 0.3 points vs the diffuser. so I had to dial back the regulator. Appears to be more efficient, so far working well. No more dicking around with the diffuser, would have to bleach it every 3 or 4 days or it would start to clog up.