Wilting and spots on fan leafs..Please help

Hey guys, I have just opened my cabinet to find wilting leafs. Yesterday I did a water change out and had noticed a few leafs had some very light dark spots appearing. Today the plants looked great everytime I looked in on them. The roots are not slimy and are white with a just slight light tan color. I was just checking them before I went to bed and was shocked to see leafs wilting and the dark spots spreading. I did a water change yesterday and my nutes are around 600ppm with a ph of 6. It was a minor increase in nutes yesterday but they seemed fine for 20 hours after the change out. Looking at the pics from yesterday to today you can clearly see the change. Any thoughts?

your locking out calcium at 6.0

whats the temperature of the water? and when you do water changes do you keep the water at a constant temperature as the original temperature?

Do u hav spider mites?

Bring your ph down to between 5.3 and 5.8. That should help.

snutter said:

Bring your ph down to between 5.3 and 5.8. That should help.

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I second that, definitely a cal/mag deficiency from lockout do to ph. Fix that ph or your gonna have a lot more problems with nutrients getting locked out. Other than that the plant looks great my friend. Good Luck

Thanks for the input guys; before I went to bed last night I went ahead and changed out 5 gallons of water to lower the nutes back to last weeks PPM which brought it back to 450 PPM and the wilting is gone. After reading the post on here I have lowered my PH to 5.6. After making the PH correction does the spotting go away or just not continue to develop on the new growth? BTW, being my first grow I am probably a little more paranoid than I should be and I really appreciate all the input to help me get this right. Ironically, these little girls are starting to feel like a pet..lol

The brown spots will stay on the leaves but the new growth wont get it, if everything is in fact fixed of course.