You will need to test the CO 2 levels to insure the safety of you fish. Levels in excess of approximately 40 mg. Surface turbulence can increase oxygen content and deplete excess CO 2 at night. No surface turbulence during the day can preserve CO 2 levels. When rainwater reaches the ground and flows through the soil, hardness-forming substances mix with the water in varying degrees.
General hardness is determined by the quantity of dissolved magnesium and calcium ions.
An ideal General Hardness would be 2 to 3 . Carbonate hardness plays an important role in the buffering capacity of water. An ideal Carbonate Hardness would be 2 to 3 . There are three primary types. Solid fertilizer will have the most powerful effect on your plants because they are absorbed through the roots.