The Internal Overflow System in my Nano tank(31x31x36cm) has a filter pump that can adjust the flowrate(not easily accessible though). The outlet of the filter pump is near the surface of the water. I try to angle the outlet port to create a vortex to as to minimize surface oil. For a planted tank with CO2 injection using a in-tank atomizer that creates tiny bubbles, should I set the flowrate rate to maximum to assist those tiny CO2 bubbles floating on the surface to dissolve in the water and increase water cycling rate through the filter media or should I set it to minimum so as to minimize water turbulence as I read somewhere is more appropriate for a planted tank? 2 schools of thought. Will someone shed some light to enlighten this beginner.
TIA.
Ideally for a planted tank with Co2 injection, the water surface should still have gentle ripples (but not splashing water)... if you see Co2 bubbles rising and floating on the surface, those are already being off-gassed into the air, what you'd want is the tiny bubbles to circulate down into the tank and stay submerged for as long as possible to diffuse into the water. Try to angle the outflow towards the atomizer so that the current pushes the bubbles downwards towards the substrate.
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