hi elwen
arent you having a regulator at the present moment?.....if your current regulator does not have a needle valve for fine tuning...and you are using the main valve from your cylinder, you may have problems trying to control the flow rate.
It may be best to get a regulator with two gauges....the first gauge is to monitor the tank pressure while the second monitors the flow pressure that leads to the needle valve and best with a solonoid(as you have already answered the reason why)
The next thing is that you need to understand the relationship of CO2, KH, and PH as they are very closely related. It may be good to get a KH test kit and test your tap and tank water...for any planted tank, the correct KH level should be around 4 to 6 with PH ranging from 6.5 to 7
Whether 3 bubbles per second is too much then leads to the question of ...again your KH and PH level for optimal dissolved CO2 in your tank...for this part, again it may be good to have a CO2 test kit that is submerged in the tank itself...most of this kind of test kit indicates through coloration of the liquid within...blue = insufficient, green = optimal, yellow = overdose
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