I am experimenting with worn castings for starting seedlings and for Hydroponic nutrients. PH of the powder is 8.0. Has anybody on here used it in their worm bins for grit or PH control? The idea here is to add micro nutrients to the worm castings while while controlling the PH of the bins. Any thoughts at all on this. All my germination test in the worm castings have been positive. Thanks all.