Double Strawberry Diesel from Rez.
I have been using Pro Mix for 13 yrs, I prefer the BX 3.8 bale mixed with 1 bag of Extra Chunky size 4 Perlite with 1 30lb bag of wiggle worm EWC.
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No, you are not ruining your pro-mix.
I feed GH Flora with Cal-Mag and Floralicious plus, in Pro Mix.
I would not call these DSD plants ruined in any way.
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Myco might not like it, my plants don't mind tho'