The Sherb Trees

Howdy. I'm basing this answer on a 4x4 tent and focusing more on what you mentioned in your entry, not the question, about your chiLED logic 660. I like LED tech and looking up things I've never seen. I've never seen this! Holy friggin powerful and with supplemental UVB too boot. Anyway, I checked their specs and if you're in a a 2x2 to 4x4 they recommend a 24" buffer space for adequate, even intensity and flowering footprint. Most all LED's I've seen have been 18-24 inches but this is the first time I've seen a manufacturer spec for 24".... Your girl does seem to be cupping a bit too early at this stage of flower and it does look like she's burning a bit. This beast of an LED could easily be SOME of the symptoms you're seeing around the top section and you cola fan leaves. As for the actual question about Nutrients (lol). I feel you're totally fine, do not stop. A flush is good once in awhile but they want the goods real bad right now. The reddening I believe to be the phenotype and not a symptom of deficiency 👍. The browning a symptom of light burn/stress😕. I hope this helped. Girls are looking good and getting fat! Got's nothing to worry about my friend. Cheers and good luck in the coming days👌☺️

You may have overfed her, causing the dry brown spots and burnt tips I see, this could have then caused nute lockout. Flush the medium and apply a foliar spray until she’s ready to be watered and fed again.