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Plants are driving me crazy! please help!


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hey everyone,,im in need of some advise about my plants,they are growing under a 400watt hps light,with perlite,feeding by hand 2 3 times daily with hydroponic fertilizer,(flood and drain),,,over the last week or so,they have started to turn a pale yellow colour,ive tried flushing,and feeding with a light fert,but no change,would this be heat stress?,,any sugestions?,,
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The Don Won

Plant of the Month: June 2008
Re: plants are driving me crazy!,,please help!

whats the PH of the water and the PPM as well? pictures would be helpfull
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