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This page will give you a good base of knowledge to make decisions on. Recommend reading all of it. http://www.growweedeasy.com/co2

on second thought that doesnt look like the issue. I see a number of things that are concerning from leaf finish to spots, but im not familiar with your plants at all so i cant give much meaningful advice other than to improve the quality of your grow space.

boron lockout due to low ph maybe. if youre below 6 at all boron is locked out and new growth will twist up on itself.

thats one of the least efficient ways to administer co2. atmosphere is 400ppm and youll be aiming for 1000 to 1500, dry ice wont likely get you there in a cost effective manner. co2 isnt worth doing half-assed. Get a burner and choose your fuel. Using your municipal gas utility is best.

floragrow set on amazon. follow the directions, skimp a bit on your mix if your worried and feel it out. keep ph between 6 and 7 post mix to avoid lockout. lift test and check top inch of soil before watering. youll be fine.

ya your lights and your fan. the lights actual par output and spectrum is what matters though. im assuming your massive fan is AC, your fan controller may not scale the speed the way you think. Throttling AC fans properly is expensive and complicated. keep those lights up high to start and...

advanced plat explaining why wattage draw isnt all that matters.

you SEEM TO have an ISSUE CONTrolling the VOLUME OF YOUR VOICE!!!!!!!!!! setup sounds good,maybe a little overkill for a 4x4. 8 inch exhaust fan? whats its cfm rating? you want 105 cfm max. if you move way more air than u need to youll not oonly waste money but be fighting to keep temp and rh...

lol water that plant!

get a ph adjustment kit and lab strips on amazon.

if youre not maintaining ph between 6 and 7 youre locking out. Looks like overwater. Tiny cups.

Those are beautiful buds bro. Do you know why the lower humidity promotes fatter buds?

Looking better than I expected. Why are you worried about mildew? 30% rh is low. I wouldnt drop below 40% unless you've had a watering incident. Your root systems are fully developed though, probably isn't hurting anything keeping it that low.

http://www.growweedeasy.com/co2

Reminds me of the guy who's wife sprayed his plant generously with mouthwash and rubbing alcohol to treat mites. lol Plant looks great, paint can is a funny touch. Probably gonna want some more room for her at some point :).

The water dilutes the concentrate and distributes the nutes to the entire root system evenly. If you don't already, I'd get a oscillating fan blowing over the actual soil to help evacuate the moisture faster. (If you use a static fan you risk wind burn if a leaf gets in crossfire) If you water...

Awesome, excited to see them bounce back.

Id get more pictures of those dark splotches, both on the leaf you showed and on other areas you see it. I think the people citing nutrient deficiency might be right.

Im interested to see how this ends up. Monster cropping so you have a single outer canopy layer makes sense. Going so far as to diminish your light receptive surface area like you have doesnt make sense to me. Nutes are the vitamins, light is the food, food turns into bud and your plants are...

Thats a really tough question to answer because it hinges on too many factors over a long period of time. Even your light can vary greatly while maintaining wall draw. 130 watts from an advanced plat light is not equal to 130 from a marshydro. when youre part way through budding post some pics...