Any Tips on indoor Chemdawg, or help maximizing my yield

i got a chem. from my local oakland cannabis club on 4/23/09 and it now tied over to achieve more light. I am using a agrostar 400W hps, and using patio plus soild with guano and all kinda goodies. I am also using fox farm GrowBig for vdg. and tiger bloom for flower. anyone with experience in this strain please anyhelp or tips on maximizing my yield would be great.:joint:
 
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