So, Whats the most important substance in the tank ? the CO2,NO3 and PO4. Whats the meaning of NO3 and PO4 ? Where can i egt his kind of substance? I saw a bottle of liquid which gives all this nutrient inw ater. but how much is too much and how can i measure how many drops of these nutrients in my tank ? How do i calculate how much light is enough for my tank ?