Any idea what deficiency this is ? Cal mag ? I&#03...

Few potential calcium rusty spots. Would kick out silica. Branches are stiff, no need. Would heavily reduce nitrogen ( forget at least for 2-3 waterings totally ) and increase bloom fertilizer or pk part if you have separately .

Ok, so after looking through your diary. Read a lil bit. The thing is with organic products some can take up to 3 weeks to release their readies. So, run-off is practically flushing all that out. Not giving it time to take hold. Things like cal and that you're possibly flushing out with every run-off. Also, I see you using soil.. you shouldn't be letting your sub get that wet every feeding. It really isn't good. Roots need to breath. And part of how that happens, is when the substrate dries in from top down it draws in co2/o2 in to your sub and so on and on. As for the spots. And nutes. I reckon you stop with the run off and that sound even itself out. A calmag will help. But as your in soil. You only need give core feeds and Calmag once a wk. Soil has a much slower affect on a plants physic. So, let it get back eating as a soil plant should and then reval the situation

Could be calcium. It's not always clear with calcium deficiency. It never seems to be consistent with how it displays on plants. I'd suggest you use calmag every watering. If you are in Coco, what i do is feed, then 3 days later, water with calmag, repeat. I just finished my first crop grown in Coco. Never used it before, so i am no expert by any means. But my regiment saw my plants through start to finish with only 1 over feed hiccup which was due to high ppm in my tap water that i wasn't aware of.