So I am posting about a WWxBB grown from seed, that has been getting some odd rusting in the leaves. It is 33 days from seed, and I have been feeding it 1/2 strength botanicare pure grow, with calmag, mixed in water from my RO filter, which comes out 5-20 ppm. I ph the water to 6.3-6.5 , and feed when the pot feels rather light, and the soil dry. She is growing very fast, overall plant health looks good, so I trimmed off the problem leaves and took some pictures, what do you guys think it could be? Here are the pics, these ones look pretty mild compared to the worst And here's the worst looking one Sorry about the horizontal pics..it comes up like that when i upload for some reason.
So I have been told by somebody that they believe it is calcium deficiency and i need more calmag in my mix, can anyone agree or comment on this?