hairs going brown in flower period too fast

i am growing brainstorm it is a strain that takes up to ten weeks i have been using canna bio flower throughout the cycle no boosters just the organic flowering formula it is now week 7 and up untill a few days ago the hairs on the buds were 40 percent
now in just a few days some plants the hairs on the buds have rapidly gone brown to maybe 90 percent can someone tell me wot has happened please
confused

also apperantly you cannot overfeed with this nutrient and there is no need to ph adjust

go to radio shak get a magnigyer with a light..................look at the tricoms thats the best way to tell

Make sure your fans aren't placed too close to the plants, or that they aren't turned up too high. Pretty common reason when pistils start to turn brown prematurely.

Also, some pics if you could would help in identifying the problem.

they are in a tent with sufficent air circulation no fans only intake and out take with a cool tube light and a small filter it is like a bouncy castle maybe too much air is that poss

Your better off having the intake on a lower power setting than the extractor, makes negative pressure in the tent (sides get sucked in instead of out).