So, my plants are not doing too good, and I am heading to my LFS soon, I am getting new substrate, plants, decor etc. for my 22 gallon tank and I a, considering setting up a DIY CO2 diffuser. I have a few questions, do I just keep running my regular air stone as normal throughout the day? Do I need to "turn off" the CO2 at night? Will CO2 affect my fish? What size bottle should I use, and how many?