Every single time I do outos I get yellowing leaves that die.

If it’s iron/excess p, magnesium? what do I do? Coco perlite top feed jacks 321

Yes I’m aware of the thrips.

Fuckers

I just switched to Jack’s 321 in hydro and I’m finding it really greens them up. A bit of a tip burner but I think it’s more PH related than PPM. You don’t need much of it with a photoperiod in hydro. I’m around 300 PPM (.6 EC) in week 3 of veg; plants are 2 feet tall and not deficient. I’m pretty sure an auto would use less than that. Obviously your water and medium aren’t the same but it’s not so far off since we’re both basically hydro. I’m not a coco grower but doesn’t it need extra potassium and/or calcium. I don’t notice deficiencies in my grow but it might be possible the coco is taking in some of the nutes. How much PPM you giving them?

I been giving them 75% watered down jacks 321 (3.6,2.4, 1.2) I also had a couple feedings using up some of my flora series using the H3ADs version of the Lucas formula, at half strength so 3ml mirco 6ml bloom and .5G Epsom salts

Ppm has beenn600-950-1050 range

So I run the Jack’s at; A 3.78, epsom .99 and B 2.52 grams per gallon. Those are their numbers brought down from 100gals to 1. I have about a 40 gallon reservoir and my tap water is 55ppm (.1ec). I’m going to mix a tank tonight and I’m going to bump it up from the 12 gallons I was mixing for, up to 15 gallons. Should give me about 400ppm (.8ec). So 15 times 3.78, 15 times .99, and 15 times 2.52 plus some Cyco PH adjusters and that’s it in my tank except for 40 gallons of water.
Without a pic it’s hard but you mention a mag excess. The 1.2 you list is high for the epsom in Jack’s; it should be .99 grams a gallon. There’s more mag in the part A. I run a little less than the .99 in veg; probably closer to .6 or .7 g per gallon. I just went up to .99 the last tank since they’re getting bigger and I need to flip.