Nixu's Aquarium setup (Work in progres)

[roland33]

I think 2 PH sensors are enough ....
It would be verry comfortable if it is possible to show both, PH and CO2 on screen and also to have the possibility to use the rules for CO2 and PH value.
So you could observe the CO2 course better and regulate accordingly (whats happend in the night, or whats to do if the CO2 valve is hanging, etc...), this is easier than everytime calculate the other value by hand.