Gelat.OG Outdoor Clone Grow

Day 51 I thought my reveg was showing another deficiency of some sort and thankfully (as you can see in the pic) it appears to be a natural colour change. It went purple in the tent for some leaves and especially on the colas. Had a couple real cool nights and the reason it was triggered Day 52 my reveg I think grew 2-3 inches overnight. Same thing happened to my Gorilla Zkittlez clone outside