THats fascinating stuff Zandor. The Fact that GH get's 80% of their business from marijuana growers is so cool!!! I wonder if the lady at the checkout counter knows that too!!!!!!hahaha. I may have that "toxic salt build up" on the two plants from the organic grow plugs I germinate in. They are very good at developing early root structure but they are forever connected to the base of your plants where the stem grows through. They might be to blame for those leaves since they absorb the nutrients and are constantly contacting the mainstem. There might be a build up of salts in the plug from early flood seesions that actually filled the plug up with water and nutes. I only allow the floods to actually saturate that plug for like a week, and then I drop the flood level down so only roots growing below the plug get wet. I don't think a soggy old grow plug is good for the main stem so I keep that thing dry best I can.
I think I remember you saying you use peat plugs and then remove the seedlings from the plugs and place in your hydroton mix. Can you give me a link to pictures of that, and links to the plugs themselves? I might try that out. I do love these plugs I use though, they make germination so easy. No nutes, no pH buffering, just wet and go.

Last night I did bring up the Cal-mag level to 10 ml./gal. Eventhough I might not have needed it, I hope it improves things. I am very happy with the four girls right now. They are very strong.

Tell me about B1 too please. Thanks