Bubuzz

You need to up the nutes just a bit and add in some more calmag too. Good luck bud!

Those bottom leaves being affected are a very good sign that she needs food, yellow bottom leaves like that a very signature to lack of nitrogen. Typically if you're seeing bottom leaves affected it deficiency whereas top leaves will show more toxicities. Try to work out a feeding schedule either from a manufacturer recommendation or elsewhere. Even plants that are hot and tired need nutrition. Happy growing 🍀

I hope youre not letting that coco dry out. Coco needs to be constantly wet (plant has to have an established root system of course). If you let it get dry the fertilizer builds up in the coco causing nutrient lockout and worse burn from excessive nutrients. What I would do is check runoff ppm/ec and if its higher than what you feed (by 300ppms), then you have a salt buildup. If its lower than what you feed with, then increase the feed. I would start with a runoff ppm/ec check, if its over your input (by 300), flush with a 300 ppm( Im using the 700 scale/canna nutrients) of base nutes, I would do calmag flush since coco hogs it. Then I would probably feed at 500ppm base nutes (Remember this is what I do if its 300 ppms over my input). Good luck!