leaves changing colors. cant identify.

[spudley]

distilled water
cal/mag 350ppm
foxfarm big grow 350ppm
250w grow floro
great ventilation
temp 73 degrees give or take a degree
light at like 10 inches
ph 5.9
plant is day 18 from sprout. the issue on these leaves killed the first two that i eventually clipped
I thought the cal/mag fixed the issue then two days later... bam it happens to my good leaves.
any suggestions???Attachment 287315

spudley Reviewed by spudley on 10-14-2012. leaves changing colors. cant identify. distilled water cal/mag 350ppm foxfarm big grow 350ppm 250w grow floro great ventilation temp 73 degrees give or take a degree light at like 10 inches ph 5.9 plant is day 18 from sprout. the issue on these leaves killed the first two that i eventually clipped I thought the cal/mag fixed the issue then two days later... bam it happens to my good leaves. Rating: 5