I have read many treads. People say I am dose X ml a day but do not say what size tank they have. The instructions say you can dose a minimum of 5ml per 25 gallons a week which would be 0.7ml per 25 gallons a day. Or can dose a max of 5 ml per 25 gallons a day. On my 200 gallon system that would be between 5.7ml to 40ml a day. I just added it to my system so I set it at 6ml a day and figured I would slowly increase it but was curious what others are dosing.