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One note on the Lucas Formula...which will probably also deal with the poster who is reporting the Mg deficiencies.
Lucas has made a minor revision to his Formula since the version that was posted was written up (you can find it buried deep in his Ask Lucas thread on another forum). He no longer recommends having the different strenght for veg and flowering. Now he recommends that your lighting determine what strength you use. If you're growing under flouro's use the 0-5-10 ratio. If you're growing under HID, use the 0-8-16.
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