I think this is a magnesium deficiency, but I'm not sure. What do you guys think? My ph is 7, and the ec of my tap water is 400 ppm. ???
This is frustrating. I have started adding epsom salts to my water, but I am still getting a few leaves that go yellow/rusty, and dry up.

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i'm no expert. if you look at the growFAQ, it does seem to most closely resemble Mg deficient.

http://www.rollitup.org/view.php?pg=...=article&id=37

it could be that... but the dots look too dark so i would check for spider milds first.

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keep the thumb green and the gun oiled, !

Definitely Mg deficiency - the excess Calcium Carbonate in your high ppm water is locking Mg out of the soil. To cure it, keep feeding epsom salts or get an RO machine to remove the excess salts. The RO machine is the only long term answer otherwise you have to keep feeding epsom salts and even then it only holds it in check ie prevents it from worsening it doesn't actually make it go away.

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That's what it seems to be. My water is super hard. I have started adding epsom salts, and it seems to be in check, but does not reverse. The leaves stay dead

Thanks for the opinions though. This was really bugging me.