Always get these spots.

[Damien2003gt]

This is my 5th grow, and 3rd dwc grow week 2 of twelve/twelve. Every grow, I get these spots! It's a Durban poison photo in dwc. Running remo micro/bloom us cal mag. All at full strength. pH is always between 5.5 and 6.0. Any advice appreciated.

Damien

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[wiltstone]

I occasionally get those but only under my LEDs or my cmh lights. I seem to get help from even more magnesium than from my cal mag. I use safergro fulmag because it is chelated but you can also use Epson salts. Do you use any fungus, bacteria or fulvic acid to help with nutrient aborbsion?


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[Damien2003gt]

I occasionally get those but only under my LEDs or my cmh lights. I seem to get help from even more magnesium than from my cal mag. I use safergro fulmag because it is chelated but you can also use Epson salts. Do you use any fungus, bacteria or fulvic acid to help with nutrient aborbsion?


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Hmmm.. Try some reason salts I suppose. How much per gal? And no I don't.

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[wiltstone]

Epson salts can be found for about 2 dollars at any drug store or grocery store. I personally don't use bacteria in my dwc at least until the last three weeks. The fungus (mycorrhizae) I use is Roots excelurator gold its pricey and I highly recommend Fulpower fulvic acic. The fungus grows aggressively on air stones so I take a wire brush to them in between every grow.


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[Waira]

.... looks like Ca defc. to me, likely LED induced,... how far away are the lights? Close proximity can magnify this,....
What's the EC/ppm in the res'? How much of it is water + Ca-Mg?