Quote Originally Posted by xRedDUBdeRx
Why would it not be getting to the leaves?
It most likely is. I've seen what you've described on my plants before, and it never seemed to affect their growth. If your pH is stable, and you've got a got a good handle on what you're feeding the plants, then I'd just keep on truckin'. If entire stems start to turn purple, then you should start raising the alarms.