thnx TT, and @daizeUK i totally understand where your coming from BUT, that has the potential for imbalance in co2 going up and down, i rather get it to the level i want and stable to prevent fluctuating co2 and therefore avoiding that side for algae to grow i had bad algae in my old tank if u remember and i am sure that was imbalances with co2 flow and ferts, so i am trying to do this right from the start