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Yes according to AN you can waste your money all grow long. I have found in my personal experience that once in the tank at two weeks prior to harvest works best. Then one week prior to harvest I give them a dose of molasses. If I were growing in soil it would be different in that it would be feeding the microbes. In hydro I am mainly concerned with plant uptake. There is a micro-biome but they get lots to eat from the other bennies.You can give BC anytime during flower…..