Magnesium Deficiency? Small rust/brown spots

seeing these same spots on my Gold Leaf plant, the mother im taking clones from, had been feeding it less to keep the growth contained but gave it a full feeding today and ill see how it does.

Looks like it is possible cal mag. Coco absorbs cal mag. That or I would first check like a run off ph and make sure ph tool is calibrated. If that is out of range then you are likely providing enough but roots can't absorb. Good luck and happy growing 🌱🌱🌱

Hi mate, other than a little toxicity you plants are just suffering from a PH issue. Do a slurry test of your substrate using PH neutral water. Check what way it goes. Use agricultural gypsum to lower the ph of the soil, dolomite lime to raise it. both give a calcium boost but lime has higher levels of magnesium. She is looking awesome in the diary. Good luck and happy growing