Help! Possible deficiency? Light burn?

[SMCelite36]

My leaves are starting to look a bit weird, and I wanna get any issues taken care of before they get any worse. Any suggestions?... Thanks in advance.

 

[SMCelite36]

Here we are, nearing week 8 of flower, supposedly both strains are 8-10 week flowering strains. Not sure why, but the fan leaves are turning yellow, and falling off. Buds look good, but still have at least a couple weeks left, maybe more. Will I be alright until harvest?

 

[LoveGrowingIt]

Looks like light burn. The light intensity could be lowered till harvest time. Some magnesium might help. The yellow and brown leaves won't recover.

 

[GNick55]

potassium deficiency