Hey guys, new here and hope I posted this in the right spot. I used to grow back in the day but this is my first grow in more then ten years and I'm having an issue. Got a big bud X blueberry auto fem that's on week 9 from seed and week 5 into flower. I'm growing in happy frog and was using an organic bloom nute at 5-10-5 ratio from weeks 4 to 7. The soils a bit old and was initially hydro locked but now it absorbs and drains well. She's been in a 5 gallon pot since she out grew her solo cup and short of a little underwatering issue in week 3 has been looking great ever since. Last two weeks I cut out the nutes and have kept her on straight water. I've used distilled that I've pH balanced to 6.5 for every watering she and her sister has ever gotten. Noticed a bit of Brown on leaf tips thru out plant about a week ago, now tho the top leaves are all turning brown and will fall apart in your hand, the stems don't pull out tho. There's zero signs of bud rot (thank god!) And I'm not sure if this is normal and she's about ready to be harvested or if this is a nutrient issue? Lower leaves all look fine except for a few burnt tips here and there. She's no closer to the light (led) then she has been at any other point and temp stays close to 70° all the time. Humidity is usually at 50% but my central air died the other day and now I'm around 67° and 60%. Sorry for the long post just trying to give as much detail as possible, sure I left out some things but any help would be greatly appreciated! Thank you in advance!