Day 25 Leaf Edge/stem problems?

Apologies ahead of time for my wordiness—20 inches under 400w HPS installed yesterday (100w’s of true LED’s used until then.) Fox Farm with Coco. Humidity is about 25% (too low.) Certainly not overwatering, but maybe too much nutrients (have been using first two of Fox Farm Trio) Temperature is about 82, due to HPS. Bag seed, probably Northern Lights or White Widow. Are leaves too dark? What about the stem? (Some parts are green, while others are brown and woody.) Thanks.

Swanfly2345 said:

... maybe too much nutrients - have been using first two of Fox Farm Trio ...

Click to expand...

Lighting isn't the greatest to see colour ... the warm reddish glow of the HPS bulb.

I used to grow with the GROW BIG and TIGER BLOOM (never did use their BIG BLOOM.) What I found was that I had to cut the FF liquid nutes down to about 1/2 of the recommended dose on the bottle. With FF, less seemed to do more. With the FF line, you have to continually shake the bottles to keep the shit mixed together. Within a pretty short time frame, the stuff separates - especially the TIGER BLOOM.

Another suggestion is to add Cal-Mag as the FF line is lacking. Botanicare Cal-Mag at 1 tsp. / gallon helped.