m0useanswered grow question a year ago The spots kinda look like water droplets fell on the leaves and the lights burned it.
2.2ec is a bit high, iâd probably get that at or below 1.8ec
Might need a bit of flush to help reset it, or just get a good amount of run off with your next few irrigations. This could be the beginning of a lock out from feeding to much.
Its also good to let your feed sit out n allow the ph to drift and then stabilized before adjusting. I think biobizz drafts a bit, n it does not work well under a ph of 6.2 id aim for 6.4-6.5 as target.
Good Luck!