Yellow/Brown Spots

[thesuit]

1000Kw HPS bulb
temperature 80F. Daily 90-95F spike for 2 hours!
PH 6.5
Growing medium - Coconut fiber
Nutrients: 2.5ml each of Alg-a-mic, Bio-Bloom, and Bio-Grow
Well ventilated
Extra CO2 using yeast-sugar-water

My plant is starting to get brown/yellow spots around the edges, which may be replaced by a small hole/tear where the spot was. Picture attatched.

Only a small percentage of leaves are affected are found towards the top and middle.

Any suggestions on the problem? Does not seem to be burns from the lamps. No PH problem. I have recently heard that Bio-Grow may not be suited for coconut fibers?

Appreciate any help :thumbsup:

thesuit Reviewed by thesuit on 04-28-2008. Yellow/Brown Spots 1000Kw HPS bulb temperature 80F. Daily 90-95F spike for 2 hours! PH 6.5 Growing medium - Coconut fiber Nutrients: 2.5ml each of Alg-a-mic, Bio-Bloom, and Bio-Grow Well ventilated Extra CO2 using yeast-sugar-water My plant is starting to get brown/yellow spots around the edges, which may be replaced by a small hole/tear where the spot was. Picture attatched. Rating: 5

[thesuit]

Lights 24/24
Further picture attatched.
No sign of any pests
Plant is still in vegetation