DWC Yellow Leafs, and Brown spots

[Dagardner]

my top leaves are turning yellow, and there are some brown spots on bottom leaves, water is 5 days old used a mixture of distilled and tap water , I'm only using 40-60 percent of General Hydroponics Flora Series, can any one tell me what could this be and how to fix it?
my PH TO 5.7
my water Tap water PPM is 285 and off Distilled water PPM was 5, i went half/half
Temp between 76-80
Humidity 48-58
Lights CFL (2) 125W 6500k 12 inches high, (1) 200W 2500K 16 inches high

 

[Bassman59]

pics

 

[Dagardner]

pics

@ bassman59 I posted twice you can see it here
Yellow Leaves and Brown Spots

 

[Bassman59]

They're fine, dont stress. Keep water temps sub 68f (that 50-55 is oddly cold).

 

[Dagardner]

Bassman59 I was thinking the same thing, I read a couple book and the are saying stay between 65-75 degrees

 

[Bassman59]

Bad shit won't grow sub 68f