How can 1 add pictures?? My plant is showing rust ...

It’s Calcium deficiency. But you have given them what they need. The spots won’t disappear unfortunately, but normally with the Cal-Mag it should stop.

I think its cal-mag defficiency. Are stems flexible and soft? Or more vigor and strong? If they are weak its surely calmag defficiency. Add some Cal-Mag from Advanced or GHE Calcium & magnesium.

@Mommak Its a lack of calciummagnesium and potassium , basically your plant is finding it hard to uptake those particular nutrients . Its always a good idea to have a calmag product that can be added to your feeding regime. as for the potassium some potash or a pk booster may be of benefit. Mollasses also has a little potassium as well as other beneficial ingredients that help root health. Most badly effected leaves wont recover so they can be removed as they die off .

Looks like a lack of calcium as Mrs_Larimar said. Can happen when using destilled water or osmosis-water. Tap water most likely has some calcium to prevent a deficiency. It is also recommended to add some calcium when growing in coco and hydro. You should add some single cal or cal/mag like CaliMagic. You can add pictures if you edit a week, then you cann add additional pictures.