1st Grow - Nute or pH problem?

[sliceking]

-Problem: Leaf tips are burnt, bottom leaves are turning yellow and curling/dying. Started with what looks like chlorosis(sp?)

-Medium/grow method: 5gal Smart Pots in soil - FoxFarm Ocean Forest on bottom half, Light Warrior on top half, 1 inch layer of Perlite on top.

-Feed and supplements used: FoxFarm Trio - started 1/4tsp GrowBig at week 4 (1 gal water). Switched to 1/4tsp GrowBig & 3/4tsp Tiger Bloom (1 gal water) once flowering started. Only started CalMag 1ml/1 gal at week 5. Upped to 5ml/1 gal at week 7. Watering 1 gal water every 3 days now.

-Water source: Thought I had a pH problem because I was using straight tap water in the beginning. Got a pH pen and did a flush, tested pH of soil and pH of runoff - now 6.5 every time. Usually don't water until runoff but have been as of last 2 feedings (1.25 gal pH 6.5 water). Started pHing water around week 5.

-Strain and age: Mephisto Skylar White, currently on Day 47.

-Climate: Day Temp (75-82 @ 58% RH) Night Temp (68-70 @ 60-70% RH) high RH wasn't for long. Started grow in 25%-40% RH, as they've gotten older and the weather has turned to summer RH has gone up, but keeping it managed. The house has central AC.

- Light used: ViparSpectra 300V x2, one on each plant. The second plant is doing fine, so not mentioning it here (grow method is the same).

-Additional info: I realize a lot of my problem is the inconsistency and late to the game of the proper technique. I tried to cut corners just to get started and figured I would get the additional equipment and supplies for future grows. Well, I got panicked as the plant started to get a little sick so I ended up buying an expensive pH probe (variant of the Automatic8), pH digital pen, etc.

--Pictures: Attached!

 

[sliceking]

I should add that I think there was some slight light burn in the beginning, my LEDs were about 9" during preflower. Started at 24". Raised them to 18" a couple of weeks ago and that seemed to help until the most recent leaf damage pictured in IMG_8862.

 

[namvet25]

I should add that I think there was some slight light burn in the beginning, my LEDs were about 9" during preflower. Started at 24". Raised them to 18" a couple of weeks ago and that seemed to help until the most recent leaf damage pictured in IMG_8862.

If the damaged leaves are on the very bottom and not spreading upward I wouldn't worry as this somtimes happens to older growth so just remove any lower bad leaves and you should be fine.Just a little advise,you should start using cal/mag at the begining of flowering to help prevent problems.