m0useanswered grow question 2 years ago Are you using a EC pen to confirm concentration of the feeding solution?
I have heard from a few users that BioBizz is best once it sits out for a bit "12hrs" all mixed up. The PH drifts and then needs adjustment. This might be whats happening but in the medium and causing some issues with uptake. They also do not recommend anything below 6.2 in the medium on their site last I looked at it.
So in short could be it wants more or that the mediums PH is causing some issues is my guess.
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Best Of Luck!