I’ve recently added pressurised co2 to my tank. Initially the diffuser was at the front of the tank But I read that for best results the diffuser should be in the flow of the filter to circulate the co2 round the tank so I placed it below the outlet of my HOB filter. The drop checker is in the front corner. I started out at about 1 bubble/sec but the checker was blue so I increased it to 2 bubble/sec. That changed the checker to a darkish green. I have upped it again to see how many bubbles it takes to turn the checker lime green. (No livestock at the moment) it’s currently at 3/sec. does this sound right for a 55l nano or have I got it wrong?