Hello, I'm getting some brown spots on some of my leaves. The 1st leaf I cut off as you can see in the pic. This was the 1st leave to get a few little brown spots and it got worse. Now some of the leaves on the plant are getting a few tiny spots on them and one larger fan leaf is getting worse. I checked with a scope for spider mites and didn't see any, I have a younger plant right next to it and it looks good so far. Any ideals? Thanks This is any indoor grow tent Plants in Coco temps are 73 to 81 Humidity Normally around 42% LED grow light about 4 feet away Oscillating fan on low Intake and Exhaust working PH water every feeding to 5.8 This plant is getting feed 300ppm with Cyclo Grow a/b and CalMag 2ml per gallon Last night just moved t o 400ppm. I