without knowing more info on your grow this is what I would recommend.Pull the few leaves that are discolored,if I had to guess you have some sort of pest problem.Check your plants from top to bottom,underleaves especially,usually if just one or two leaves are starting to erode then the problem is not an infestation YET.If you can get your hands on some neem oil then use it daily...the plants really appreciate it and its an organic pesticide that can be used up until the day of harvest.It simply inhibits the insects ability to reproduce and also strips the membranes of the insects skin...it is relatively inexpensive and easy to use just follow the reccomendations on the bottle....remember tho...DONT USE ANTIBACTERIAL soap when mixing.It kills the goodies in the neem and makes it useless......any more questions or if this does not solve your problem let me know and I would be glad to help further..............Phil...
[email protected]