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Leaves are solar panels for the plants. Spreading them is fine, but I would't remove them. As for density, they should start to swell a bit when then the pistils start to retract inside the calyx. At 6 weeks in you have at the least a couple a weeks left if it's indica and possible doubled for...

Do you pH test/balance your water? Too acidic or alkaline soil will inhibit the plants ability to take in nutrients; stalling growth. Water with 6.5~ pH water after a transplant into a bigger pot with some decent soil; cut standard home improvement store with perlite to make it less dense...

A 6" duct is pretty standard and most tents come with the holes for them. The CFM on this one is plenty for that size. http://www.amazon.com/LEDwholesalers-GYO2402-6-Inch-Hydroponic-Booster/dp/B003YFADW8/ref=sr_1_1?ie=UTF8&qid=1362791524&sr=8-1&keywords=4+inline+fan

High pressure bulbs get a lot hotter than cfl's or flouro tubes so I would say you need an exhaust fan at the least. An enclosed fixture with a duct connection and a inline fan running out of the tent would ensure heat wouldn't be a problem. Another thing, make sure you're ballast is outside of...

I suppose it would ~work~ but ideal spectrum for veg would be like 6500k or daylight, where as cool white is 4100k. For flower you want even lower, around 2700k. As for the intensity 48" T8 @ 40w are like 3000 lumens each, assuming you're bulbs are 4 footers.

You're soil might be too alkaline and be preventing Manganese (Mn) intake. That's my take on it.

It might be the bulb, could be it just won't burn at lowered wattages. My 2 cents.

It is just folded aluminun with a socket tacked on. If you are going to be running a 600w in a small space you'll probrably want a fixture with a duct flange. That way you can pull air across the bulb and remove the heat from the source.

That appears to be a vacuum pump for air conditioner refrigerant lines. The yellow hose is connected to the technichians guage manifold. As for the two brass fittings those connect to the low pressure and high pressure sides of the condenser's compressor. That pump is designed to pull the system...

You could try either fan, but you need to monitor your temperatures under the light. A 600w HID in a 3x3 spot will require adequate air replacement to keep your tent cool. If the smaller fan isn't cutting it, you'll have to use one with a higher CFM rating.

Is there water in your soil? If yes, perhaps too much water...If no, perhaps too little water.

Is it possible to clone a premature plant a couple of times in order to increase overall plant count? I had a single high quality seed that is at now 5 nodes and I wanted to increase the likelihood of getting a female. Simply put, can I turn 1 unsexed vegetative plant into multiple unsexed...

I did my second grow with the SCROG method. Built a 4x2 frame and put chicken-wire on top. Come harvest time it's a bitch! You gotta cut all the wire to get the plants loose, that is if you want to hang from stems. What I'll be doing on my next one is utilizing cross-hatched squares from yarns...