blue-green leaves is sign of phosphorous deficiency... should find some dark blotches on lower leaves to confirm if it has advanced that far. purple petioles is another symptom, but intense LED seem to cause this too.
So, if not caused by the light/photo playing a trick and as far as i know there isn't a genetic vaiance for blue leaves... i'd increase P a small bit and see how it reacts... becareful you don't go the other way... high P causes burnt tips and interveinal chlorosis on new growth. .. it can lockout many things if concentration is too high, so if a smorgasborg of symptoms result, consider that tidbit and reverse course.