Leaves Turning Purple please help

[BDiggity]

I'm growing northern lights autoflower and today I noticed in my tent that some leaves are starting to turn purple. I change the water every week and refertilize. According to this schedule. https://www.aeroweed.info/nutrient-schedule/

The tent temperature has gotten as low as 62 at night but normally it stays around 75 to 80° in the tent . What would be causing my leaves to turn purple? Is it a nutrient deficiency? Is it temperature? The plant has been growing for 67 days now. The pH is kept between 5.5 and 6.5 the highest. I adjust it to 6 daily. I use general hydroponics fertilizers. Please help!

 

[TheGreek_978]

The purple is from it getting cold at night. When it gets cold the leaves tend to change. It’s very normal and fine. At least I believe that’s the cause of it

 

[Cracken]

The purple is from it getting cold at night. When it gets cold the leaves tend to change. It’s very normal and fine. At least I believe that’s the cause of it

i would agree, that looks very normal. even buds and stalks will turn purple on some strains when the temp drops over night

 

[BDiggity]

i would agree, that looks very normal. even buds and stalks will turn purple on some strains when the temp drops over night

You don't think I need to add more fertilizer? I ordered I heater for the room to try and regulate the temperature at night. It should be here Saturday. I'm just concerned, because I saw this purple change happen to another one of my earlier plants and it didn't recover. Eventually the whole plant turned a dark purple. It was a soil plant, but this one is hydro.

Thanks for your responses!

 

[TheGreek_978]

You don't think I need to add more fertilizer? I ordered I heater for the room to try and regulate the temperature at night. It should be here Saturday. I'm just concerned, because I saw this purple change happen to another one of my earlier plants and it didn't recover. Eventually the whole plant turned a dark purple. It was a soil plant, but this one is hydro.

Thanks for your responses!

62 at night is fine a little low but fine. I think my tent gets down to about the same like 64ish and during the day gets to 74-80. I wouldn’t even add the heater, only if your tent is getting to temps like 50’s.

 

[BDiggity]

62 at night is fine a little low but fine. I think my tent gets down to about the same like 64ish and during the day gets to 74-80. I wouldn’t even add the heater, only if your tent is getting to temps like 50’s.

Thanks for your help!