Open it up. Im sure theres no air movement down there and its a microclimate down there just waiting for pm to take hold. I learned the hard way. I have a similar room.
Coco dtw. Everything on timers. I run 48 in a 12x12 with 1 gal pots. Lot of work but i only go to my grow every 3rd day. I have a full time job. Definitely far from my first time like yourself. But if you are passionate about it you will succeed. Shit i see people on here growing dank and its...
If u are putting in 300 ppm and 900 is coming out and you are in soil i would give water only the next few feedings. Your ppms are so high because your getting nutrient buildup.
That is from the clone being to moist on its leaves. So it rotted. Ive seen it many times. Dont mist the plants only the top of the dome. No vents for 3 days then vent the dome for 2 or 3 then take dome off...
I run it with co2 and im at like 28 inches and im getting foxtailing at 100%. I have 4 other 630 cmh and my plants dont foxtail under those. Next run im putting it higher.