couple leaf questions

Hey all,

I have some strange leaf problems. I have pics from different plants. One plant gets burn lines thru the leaves somehow. They aren't even the top leaves, just some random leaf set. Check out the first picture. It had something just like this on another leaf and now there are just holes. Any idea what would cause this?

Next is one of my clones. You'll notice that one of the leaves is a gross brown and it's curled up and crunchy. I think maybe I didn't harden them off slow enough ;p Any other opinions?

Next, one of my mother plants has a strange leaf problem. Some of the leaves just below the canopy are getting crispy yellow. There were too many things that changed this week for me to even point at something. I moved them under a 600W red bulb (eventually going to use for flowering), humidity was < 10%, accidentally fed them 2 days in a row... All 3 question_leaf pictures are from the same plant (3a and 3b are different angles). Any thoughts?

Thanks for any feedback :D
 

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