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I have currently started a semi stealth cfl grow. 208watts/veg and 312watts/flower. Since I'm trying to remain stealthy, the amount of space I have is limited so I want to get rid of the males asap. My question is, is there any harm in switching to 12/12 for 7-10days to determine the sex of...

It's going to depend on how much heat your lights put out(wattage), how many lights you have, how big your cab is, the type of ventilation, and the temp of the room your cab is in. You can usually keep your temps warm enough with lack of ventilation but you still need enough to have fresh air...

Wont be in the 18gal but for the first week or two and I so far the heat hasn't gotten over 84F. The reason for the setup is I've designed it for scrog

Scrog and LST are pretty good techniques if your using CFLs. Makes for a more uniform canopy that you can really do some good light placement for penetration. I've always seen better yields with Scrog or LST in CFL or micro grows. I guess it really depends on your setup and where your lights...

I agree with OldReefer, it depends on your preference of what kind of high/stone you want and your preferred harvest, some can flower in 6 weeks others on the upside of 9, 10, 11 weeks even. Some do better outside and some inside, some are sensitive to nutrients, disease, mold, ect so aren't...

I'm about to start my first micro grow with a RubberMaid setup. I've just about got the veg tub done and hopefully start veg this weekend. It's just an 18gal tub I'm using for veg, with 312watts (21,000 lumens) and 6500K CFLs However I will be upgrading to a 30+gal and 2700K for flowering...