AK 47 5th week flowering. Having issues?

Im growing four ak47's indoors in a tent. Im in the 5th week of flowering now. Ive noticed these dry looking patches on some leaves and also a couple appear to be burnt on the tips. This is my first grow so this may well be normal i guess? Take a look at the pics and see if you can help. Ill answer any questions just didnt want to have to type out everything im using or have in the tent if its not relevant. Too much typing!

youre doing great man youll have some very nice smoke soon dont worry too much about the dead leaves cut the dead ones of and if it gets worse after u took all the dead leaves off then maybe too much nutes theres loads of thing but they look nice to me peece niggerz

looks pretty good man, pretty typical for ak47, maybe up your food a pinch but totally unnecessary. remove any dead foliage you have at the bottom