COCO Growers:
1. Are you growing from seed or clones? Clone
2. How old are your plants? 12 weeks
3. How tall are your plants? 4 feet
4. What size containers are they planted in? 5gal
5. What is your soil mix? straight Canna coco
6. How often do you water and what type of water do you use? multiple watering during lights on. 6 times@10 seconds
7. What is the pH of your water? 5.8-5.9
8. What kind of fertilizer do you use and what is its NPK ratio? close to 100-100-200-60
9. Do you foliar feed or spray your plants with anything? no
10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights"). 4 lights @1000w double ended. 4000w total
11. How close are your lights to the plants? 24"
12. What size is your grow space in square feet? 100sqft
13. What is the temperature and humidity in your grow space? 76 45 day 70 37 night
14. What is the pH of the soil?
15. Have you noticed any insect activity in your grow space? fungus gnats but I killed them
16. How much experience do you have growing? 15 outdoor 2 indoor

This is what the rest of the room looks like

Nobody has experienced this before. The problem is now spreading to the other pristine plants quickly. Same exact thing. I’m feeding 650-700 @ 10 second intervals 6 times at lights on. It doesn’t look like nute burn, nor is the runoff abnormally high. It’s coming out pretty close to what goes In. I know people say you can’t over water in coco, but maybe I’m watering to frequent? Any help would be awesome guys im starting to worry a bit. Last week I did a nice flush then fed with 4ml per gal. Micro and 10ml per gallon bloom. Along with other additives from GH. And haven’t noticed any improvements.

Having perlite in does help with the drainage aspect. I water mine at lights on for 1 minute. Then 4.5 hours later for a minute then again 4.5 hours for a minute and then let it dry out for 15 hours. Works really well ! Not sure what the issue is with yours tho. Off the top of my head I’d say fewer and longer waterings. See if it helps . Otherwise flush em. Supposed to be able to fix anything like that