Crispy brown tips?

Ummm...what? Ya lost me there goat fucker...

drop your ph!! leech soil with 6.3-6.5 ph distilled water, but it`s just my opinion. over 7.0 ph will put your plants in nute lock, which means it wont absorb the nutrients. a simple solution to lowering ph in the water would be to add distilled white vinaeger

i beleive it may just be the old leaves dyin because only the one and 3 pointers are doin this, all the others are a nice sativa green and doing fine.