Purpling leaves

3 weeks into flowering and she does not look happy. Doing this slowly over the last couple weeks and was hoping it would work itself out. A def change over night. Temps are on the cooler side during its dark period down to 62sh and up to 75 with lights on. She’s in a 27 gal sip under 480 watts qb’s. She’s due for her next top dress of feeding with gai green/grokashi/ewc. Any thoughts?

Looks like they are Way under fed or your ph is way off. If the ph is off just adjust it to the proper level. If the ph is good up your feed like 25% and give it a good foliar feeding with bloom ratio nutes or a bloom tea.