well, though i wish i knew for sure, as i've been bashing my skull in trying to figure out th reason for the yellowing, i have the answer i believe. i hope somebody who can benefit from this. all my Grape Apes are suffering from the DAMN HydroHut Deluxe they're in. we went to the hydro shop we got it from today and sure enough, they said absolutly disassemble it, there is a recall. the toxins from the hut are causing the yellowing. now i'm 3 weeks into flowering with my baby apes are suffering from toxins. YIKES!!! looks like the hard work just got harder. trying o figure out the next best step. any suggestions would be greatly appreciated. my hut is in my garage, outside the hut i have my 3 big Lavender momas along with the nursery. 24/0 lights. :wtf3: