Plant leaves are starting to turn brown!!

[Nyc_legend]

E-indoor
E-hydroponic
E-hydroton
HCL-Hydro
SCLR-PH 5.7-5.9
E-Poland Spring Bottled Water
E- ph 6.5
E-3 weeks
E-general hydroponics - Floragro
E-6 times a day for 2 minutes
E-2 CFL's, 6 inches away
E-80-85 day, 70-75 night
E-60-90%
E-18/6
E-none
TR-yes

Nyc_legend Reviewed by Nyc_legend on 12-05-2008. Plant leaves are starting to turn brown!! the edges of my plant leaves are starting to turn brown. at first it was just one plant so I ignored it, but now all plants are starting to show some brown on the edges. my plants are kept in a small grow box. the grow box can get very humid at times, so twice a day I open the door to the grow box for a couple of minutes until the humidity goes down. Any idea what it could be? Rating: 5