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Hy welcomed to the community @mfdenman
I just recommend any nutrients that bloom and micro
They will need in flowering stage
Happy growing 
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Which MG soil did you use, recently MG has been putting out organic soil. It is likely more friendly to cannabis. Your girls look good currently, so may need to check runoff ppm’s before you hit her with nutrients.
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Nitrogen is needed for the development of foliage and the production of proteins. Phosphorus is critical for root, flower, and seed development. Potassium is a requirement of overall plant health and aids in water absorption. Cannabis needs different amounts of essential macros depending on the stage of development.
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MG moisture control