I guess an even worse problem is I'm already using distilled water. I think I've pinpointed this as a Calcium deficiecny, which would possibly make sense as I decreased my amount of Cal-Mag that I used in the reservior this week to be more in line with the micro and bloom I was adding (I thought too much Mg would cause an N lockous). I'm going to change the resevoir tomorrow and hit with same nute formula, except 6 mL/ga of Cal-Mag instead of 4. Either that or leave the mixture in the rest of the buckets, go back to my previous mix in the two I had already dumped, and foliar feed with Cal-Mag. I don't think the light is too close to the plants, though they are in the younger stage, I've been hitting them with light 24/7, so they are already 8-10" tall. I'm only using a 400 watt MH, and it's 14" from the tallest plant at the moment. I'll keep this updated for anyone who cares. Thanks!