Hi all. Can't seem to find a similar picture on any threads, so hoping for some advice, please. Growing 2x Charlotte's Angel cbd autos under 600w(450w) Mars Reflector in a 8'x4' tent with seven other autos, all in coco and using plagron nutes. Currently at day 46 and in flower. On one of the Charlotte's I have one leaf with these white spots at the tip. No sign of pests anywhere else on this plant or on any of the other ladies. Leaf is a little dry, also. Any suggestions as to what I might be looking at? Can anyone help a girl out? **Not allowing me to add photo here, so I'll try and edit.