Leaves developing spots - Need help identifying what the deal is, Cannabis Whisperers

Hello,
I have a 2 plant aero grow going, they've been in the system about 3-1/2 weeks, and one of the plants started developing spots about a week ago. Here's what I have:
Homemade aero tub with a buttload of nozzles
Tub drains into separate res
396gph pump
8 gal res
250 watts of LED light
I keep pH 5.5 to 5.8
I have to keep ice bottles in the res to keep the temp down, it's usually around 71 or 72
I'm growing a lemon skunk and a ny diesel. The diesel is freakin' awesome, a very happy plant. The lemon skunk started showing spots about a week ago on the bottom leaves, at the time I had no nutes in the res. I flushed and cleaned everything last Sat and using Humboldt Grow, Micro and a little Bloom, the ppm is now at 600.
The pic shows the lemon skunk as it looks tonight, with the spots on the leaves. Upping the nutes didn't affect the spots, they seem to be showing up on newer growth, but only the lemon skunk.
Any ideas what these spots are telling me?
Thanks much!
 

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MeJuana

Well-Known Member
Calcium Magnesium deficiency I believe, and I agree with that start number 600PPM is good. All the spots will stay forever, new growth should not have them.
 
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