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So I have a 165cfm active air inline fan with a can lite 4" carbon filter in a bedroom closet(6' x3')with a diy fabric door kinda like a tent would have. My intake has air forced in by a make shift vent coming from a window AC unit. I have negative pressure cause it will suck the door closed...

It's my second grow n managed to rock iton first grow but seems this grow is a bit different. I'm getting yellowing on leaf tips and some minor brown spots on leaf tips. It's WK 5 in flower n looks like a nut lock out I would assume but what kind and how can I fix it. I get leaves yellow during...