Just got around to blowing these up.

Looks like you have Thrips.;

Attachment 292070
The small scooped out spots in white outline are the damage.
The red outlined are the culprits.
I'll bet that you find tiny black dot on the undersides of the fans.

Here's a good place to start;
Thrips: Identification, Control and Prevention of Thrips

Aloha and good luck,
Weezard
Weezard Reviewed by Weezard on . Fan Leaves Dying 292031292032292033292034292035 It's not too bad, but it's starting to slowly get worse. I've been feeding with the recommended dose of 2 teaspoons of FoxFarm Big Grow ever other watering, so for example, if I feed on a Monday, I might water on Wednesday or Thursday, then I might feed again on Friday or Saturday respectively. I PH the nute/tap-water mixture and I PH the tap-water before giving it to the plants... The PPM level of my tap water holds suddy at 100PPM (+/- 5). Any thoughts? Rating: 5