A couple C02 questions for a pro
Is it possible to grow big healthy plants in my 75 gallon tanks without a c02 canister. Currently, I made a DIY c02 system with two, 4 liter milk jugs. I know this wont do much, but I think it will raise the c02 by 3 or 4 ppm. im only using 130 watts of light over my 75 gallon so the plant's don't nesseceraly need a c02 tank to survive. With proper nutreince, will these plants grow big enough to cover the back wall of my aquarium? considering I only have a DIY co2 system and 130 watts of light.
Also, I know fish breath o2m and exhale c02. If you have big fish, will they contribute to c02 production in the tank?