Top leaves yellowing?

Hi guys, this is my first grow and I’m starting to get concerned after I noticed some of the new leaves on my fem W.W. turning bright green. I have never seen them like this before. I flipped her into 12/12 two days ago, and checked on her today after I heard the light go on only to see this. I’m not sure if this is a result of being put into flowering, a deficiency of some kind, or maybe I’m worried over nothing? I water her after the top 1” or so of soil is dry, so about every 2 days. I fed her a small amount of fox farms big bloom nutes about three or so days ago. I even tried lowering water Ph w some added lemon juice, as it was reading at about 7.5-ish. She’s looking the same today, maybe even worse. Any help is appreciated and let me know if I need to provide more info.

I think that is normal. The rapid grow they go through when you chance your photoperiod to 12-12 makes them do that, after a few days they will look green again.

its normal

The yellow leafs are new. Meaning there growing bigger. They will turn darker green and when a new set of leafs coming in will be yellow. Keep up what ur doing

Thank you guys, guess I was just being paranoid.

Better safe then sorry lol

.

Katie you're PH should be 6.3 - 6.5 for soil.

.

So 980 - 1260 ppm