Leaves browning

My leaves are slowly turning brown, getting crusty dry, and dieing off. Even the buds themselves are starting to look smaller than the rest of the plants. This is only happening to 2 of the plants and the rest seem to be in healthy condition. All plants are on the same light, water, and feeding regiment. Indoor grow setup under high output florescent fixtures, properly controlled humidity and air temp. Plants are auto-flowering type.

Any ideas?
Also tell me if i need some better pics.

Attachment 280539Attachment 280540