Grey spot lines?

Looking kinda heavy on nutrition for a little one. But purple or blue is a temp issue with getting too cold. Mainly roots getting cold causes it a lot. If indoor and cold is happening at night. Can switch light schedule to have plants night time in day and their day time at night. So Temps won't drop as low. When lights off. Good luck and happy growing 🌱

Hello in my opinion your look healthy but this color is mor purple for me and i think it is due to low temperature during the night so the plant generate pigment anthocyane ( purple) in leaves to protect herself from the cold. Try to increase temperature during the night and it will become green again Good luck my russian friend. Good luck for your grow. Bye