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Ok, will try and explain best I can, first of all I have grown for about 4 yrs, had few problems, am not a newbe but am stumped., I am growing an ice strain, they have been beautiful up until this point (6weeks into flowering), ok lets start with what I DO HAVE.. I have fresh air, exhaust...

Plants were beautiful and within only a couple days the tips on about 3 plants yellowed, and appear burnt............. causes? I am running both metal and hps lights in the same room.. they are close to bud stage.. any help would be greatly appreciated