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Depending on what type of bennies you are using, they should colonize the Rockwool just like any other type of medium like soil. Check your instructions that are coming with your bennies to judge how often to be using them. You can over due it with bennies so you don't want to do to often or over due it with them.
i can vouch for earth juice biorighteous an recharge work well with any rock wool. best rooting combo i have ever used beside cannas rhizotonic.
using the biorighteous an recharge produces explosive roots when they get under way. i also use dip-n-grow to start. ph 5.5, couple hundred ppm of food
roots lift up an twist the gro blocks
these blocks where all symmetrically placed in the the clone tray. 15-18 a tray. rows of 3. they all moved. look how crooked the roots made the blocks in the back