i was just wondering about Co2 in my tank. Right now its a 10g with just two mollies, some mongo grass and some dwarf hairgrass. it has a PFS substrate with floruish tabs through out. i was looking at making a diy Co2 reactor with a ocean spray bottle. I guess my question is, is it needed now or if not when? Also how can i control the amount going in i wouldnt want to fry the plants or the fish.