well normally one would just re-fill the ressy with all of the above in the correct doses, perhaps giving a quick flush and monitor Ph thats the simplest solution (baring in mind those spots will never heal but stop appearing ) ..however it would also be nice to find out what the issue is especially because its been caused by some other factor....my simple answer would be to change out the res today watch the Ph and add correct amount of Cal-mag. another option is to add more calmag and gamble it but that's not what I would do at this point especially since its exhibiting another deficiency.
The potassium is locking the cal out because its also in grow formula and the sulphur(?) like defiency is just another symptom of adding them both together. I assumed you were using a GH 3 part mix. nice one bro haha
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