Ph Controller

[hforney]

I have ordered all components online for my CO2 injection system. Once my system is up and running how do I determine what ph I should set my ph controller at? This is my first time experience with CO2.

Thanks for any, and all advice.

[BrianNY]

This is easily determined by understanding the relationship between ph/KH and CO2.
Chuck Gadd provides a calculator which should help you here. It's also an excellent resource for planted tanks. www.csd.net/~cgadd/aqua/articles.htm

HTH

[hforney]

Thanks Brian! From the look of the chart I will probably have to set my ph at 7.0. My Kh measured 8.0 when I first set the tank up and has dropped to 6.0.

One more question. Will it be counterproductive to run an air stone at night when the lights go off? I was thinking this might provide additional oxpgen for the plants and fish at night. I don't remember reading on this forum where is advisable or not. Just a newbie trying to get answers. Who knows, maybe I can help someone one day.

Thanks again!

[BrianNY]

No airstone is needed. Ideally you want the CO2 level between 18 and 25 ppm. Just keep slowing the bubble rate until your pH tells you you've achieved that level.