1. Aqua Hero

    How long will 5kg of c02 last?

    In the the near future i may use pressurized c02 but one thing thats bothering me is how long it lasts. i have looked at some many posts on different forums and i still cant get a decent answer. the tank is 120-145ltrs dual 24w t5 unit which are on for 9 hrs a day 7-10x turnover from filter but...