Hey GC, first time grower here. My plants are right at 4 weeks from the day they sprouted. So far the have been doing great and have had no issues. Within the last 2-3 days, one of my plants (my white widow) started to yellow/brown at the tips of the new growth. I've also noticed a couple of the lower fan leaves have developed a bit of burned/brown tips as well but I wasn't too concerned since its very minimal. But the yellowing new growth tips seem to be affecting all new growth. Any suggestions as to what it could be? Set up Grow tent 2.7x2.7x5.5 Strain: grown from seeds, 1 thc bomb, 1 white widow, and 1 sour turbo diesel Soil: FFOF Nutes: FF Trio, been using big bloom and grow big at 1/2 strength based on the FF feeding schedule Lights: 2 300w mars hydro LEDs with 2 cfls as side lighting Fan: 6in Max can pro Filter: 6x16 phresh filter Water: distiller water ph'ed to about 6.6ish and runoff has been coming out at 6.2ish Let me know what you guys think, any help would be appreciated. Here are a few pics, let me know if clearer pics would be helpful. Thanks! http://imgur.com/a/hj8GB