well i started some seeds,about two or three weeks ago,the plants seem to be growing,but they starting to turn yellow..I started the seeds in 1"rock wool cubes,i soaked the cubes in 5.5 ph water,i keep the cubes,moist all the time...I keep them under a 600 watt mh,i have cool air flowing thru the light,the humidity 45-50,temp 68-75f,i have a fan,blowing air above the plants....I don't know what.s wrong...Can anybody help me out,with this matter..thanx
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