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I have a 400 watt mh/hps cool tube temps are 77 to 79 with 4in 120 cfm inline booster fan exhausting air out. My box is 3Wx2.5Dx6T I was thinking I would use the booster for intake and get a squirrel cage fan 6in 400cfm for pulling air through the carbon filter through the cool tube and...

OK so I'm using ffhf and LW haven't added any lime I'm using mix of the 2 with perlite a 50% LW 30% HF 20% perlite for seedlings and 50% HF 30% LW 20% perlite no lime I have two seedlings one is 2 weeks 4 days the older one is 3 weeks 5 day under a 400 watt mh in a cool tube reflector my temps...