I'm using Metricide 14 as an algaecide in my high light tank and also glut carbon supplement in my low tech tank. My question is regarding its active life in water. It's my understanding that when introduced to the tank, just like seachem excel, it is available is a carbon supplement within 12 hours. After an additional time period, if not used by plants, is it still available as carbon or turned inactive? I'm asking because when I dilute a mixture in a seperate bottle I'm mixing in water and the solution may sit for a couple weeks. No point in mixing a solution if it will become inactive after a certain period of time because of the water I'm adding in.