I ask this because I want to inject CO2 into my tank because of the general hardness(KH) is over 300. Will this hurt my fish or cause any trouble? Also, how much do I use?
I know, but in the planted section there are many in depth articles and charts involving co2 and how it affects the other water perameters. Unfortunately I don't know my way around the planted section to point you in the right direction but give this link a shot. This should help to understand just the basic workings of co2.