When I was a kid I used a soda bottle, water, yeast, sugar, and some air hose to make co2 for my plant project and I found somewhere online and they use an air stone and throw it in fish tanks. I have a really nice planted tank with out any co2 and would like to see some outstanding growth. Am I wasting my time making this is there a cheap alternative product that works great. Also any fertilizer I can use that's shrimp and fish safe?