Spots on leaf

Need some help, spots on one of my mother plants, below are details of where I am at right now in time.

1) I have two mother plants at going on 8 weeks from seed.

2) Fox Farm soil

3) No nutes

4) Tap water and then switch to RO water 4 weeks ago

What do you think is causing spots. They are more brown/copper color than yellow. Any help is appreciated :)

Magnesium issues,.. caused by using RO water without the proper nutes like Calmag.

Here's some reading material:

Marijuana Plant Abuse

http://boards.cannabis.com/hydroponi...lmag-plus.html

Quote:

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Originally Posted by Vancefish

Magnesium issues,.. caused by using RO water without the proper nutes like Calmag.

Here's some reading material:

Marijuana Plant Abuse

http://boards.cannabis.com/hydroponi...lmag-plus.html

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Thanks for the feedback, appreciate the links to the info.:)