have you filled out one of the troublesooting forms in the plant problems section? I looked and I could'nt find one that you had posted, maybe you might think about changing the nutes you use? what are you using ? plz start a new thread in plant&problems and fill out a troubleshooting form

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check this out;
http://boards.cannabis.com/indoor-gr...-bubblers.html

4.5 lbs with a hydro setup