White Tips?

Temps72-74
Med FFOF soil
Rh32-42%
600w mh positioned at 20k lux
3 1/2 weeks old
Aurora Indica

So I have noticed these white tips developing. I recently went from solos to 1 gal fabric pots in ffof. Also found out the water I was using was distilled BUT had added minerals in it! I had unknowingly been using this water the whole grow. Luckily ive only given them nutes (ff grow big) at only about 30% strength in two feedings since I transplanted. Ive kept my ph between 6.3-6.8. This mix of hot soil, water and nutes is probably whats causing the tips to go white.
Is this something I need to worry about? Ive only fed once since and it was plain old distilled water ph'd to about 6.6. Just kind of waiting and seeing what happens.

Doesn't look immediately probelm-esque to me. All your temps and and ph sound perfect. Give a look under your leaves. Look for any eggs, any movement. Unless I am wrong in my assumption that this nothing to be worried about, then I would just carry on with your previously scheduled plan.

Ive checked under the leaves and so far no spider mite evidence. Thank god.
Thanks for the input. Im just postin it to see if I may be missing or overlooking something. Just a wait and see kinda thing.

Looks good to me too..^^ worth keeping an eye on, but looks harmless. Happy growing,
Gaz