All 4 strains starting to purple help

[2Bad]

I have 4 different strains that all slowly but surely became purple at the top of the buds , what could it be. My temp at night is 67 at lowest and 74 during lights on. First grow but I know whenever I smoke purple bud it seems like degraded or am I wrong.
edit : I’ve messed up quite a lot on this grow.. I will admit it could be literally anything or a combination but if I could fix it before it’s too late I’d much appreciate it. They could be root bound these seeds were planted june .. 4 month veg lmfao 3 of them are in 1 gal pots and one 3 gallon, the 3 gallon isn’t that purple but the tip of the top cola just started to purple. They are coco/Perlite 70/30

 

[2Bad]

Here’s all of them

 

[2Bad]

@Ponky

 

[PK1]

what strain is this? if it is a purple strain than you have nothing to worry about. Also, at light on your temp is fine but when the light goes off, try to bring the temp closer to 80f

 

[2Bad]

what strain is this? if it is a purple strain than you have nothing to worry about. Also, at light on your temp is fine but when the light goes off, try to bring the temp closer to 80f

I’ve literally never heard of lights off having it hotter… and I didn’t order any purple strains

 

[PK1]

I’ve literally never heard of lights off having it hotter… and I didn’t order any purple strains

you learn something new everyday. i think your plant looks great and it must be a purple strain type. @Mr.GreenthumbOG thoughts?

 

[2Bad]

you learn something new everyday. i think your plant looks great and it must be a purple strain type. @Mr.GreenthumbOG thoughts?

Lol na I don’t trust it, seems backwards