Hey just curious what y’all thing this is? This ...

Generally agree with some of the other guys... I'd use a bit of extra calcium (coz reasons), phosphorus, potassium and lower nitrogen.

Lil more phosphorus and less nitrogen may need a rinse, purpling can also be caused by the cold under good light(sunlight) and ir lack of regular temperature has something to do with the chlorophyll...

I have had that happen before when she was just flowering maybe a week in. I upped my bloom nutes a little and lowered my grow nutes so it lowered my nitrogen a little and increased the phosphorus and potassium. The plant was fine after that. I can't say for 100% it's a lack of phosphorus and potassium. Hope u solve it.

Well as far as I can see it looks like a bit too much nitrogen, the sideways curl and darkening of the leaves from the inside make me suspect this. Flush with just some PH water two times and then refertilize with just phospohor and potassium, so a good bloom fertilizer. If almst ready consider flushing and not fertilizing at all, just let the plants eat their own nutrients if only two weeks left in the flowering.

They use more phosphorous in flowering

I believe that is a phosphorus deficiency mate

Or is the plant just turning purple it’s week two of flower I’m a bit lost pls help!