Oh i only gave it little bit with 10% run off....i was checking 1inch from top if moist or not
That rule doesn't really apply to coco. By that point it's actually probably way too dry if the top 1" is dry. I just water mine once or twice a day, you can't really overwater coco. I'm no expert, but from the pictures you posted I'm fairly sure your plant was given too much Nitrogen.
I guess I'm not familiar with the nutrients you're using but 7ml seems like a lot. I'm on week 2 and right now using the GH Trio and I'm adding 1/4 tsp of Micro, 1/4 tsp of Gro, and 1/8 tsp of Bloom. With 1 tsp of Cal Mag per gallon. To me, it seems like you're using a LOT for a little plant. The recommended on the bottle fried my plant. Dial it back next time.
When I used the recommended on the bottles it nute burned the shit out of the bottom two leaves. Looked online for a better grow chart using those nutrients and they've exploded in growth since. You should be watering coco at least once daily. Not every few days. That being said, only give nutes every other watering and you'll have much better luck. I'd look online for grow charts people that have used the nutrients use. I don't care for the recommended stuff on the bottle