Gentle pink on leaves

Check this out. Its on one branch of my sativa leaning strawberry blue(world of seeds)pheno.

Like almost 50 days into flower. This doesnt look like a deficiency to me but i dont know. I was hoping its just a pigment mutation.

I noticed it last night, and the pink spread a little more last night. On that one branch. Rest if the plant looks fine. Ill get a better picture tonight. Whattya think?

Under a 600whps in 3 gal coco, vegged for a month. About 50 days into flowering

Edit: i found some bud forming that is also very pink. The temps at night get to around 50-60f, i didnt think cold temps were the issue.

With temps that low at night you are going to bring some very pretty colors out. Late flower is when they start changing, get ready for some nice change.

Yep Gig is right...

its just your strain and the cool temps turning your plant, not a mutation. Its most likely cannibalizing itself as well. I had one of my strains start cannibalizing ealry and nothing I gave it seemed to convert it back green. Just feed as usual

Just sit back relax and enjoy the show. This started out with just a lil color on a leaf just like you. Let the good times roll....