Thanks all
So it'd be ok to screw the ground into the aluminum braket that the mogul is screwd to which is attached to the wood?
Sorry if I sound dense  but i wanna stay around for awhile like curt said 
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135g 1200w 10k MH, 260w PC actinic,40g fuge,15g sump,EV-180,mag 18 RTN,5 stage RO/DI.
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