Is this normal fade or an issue?

[TunaCan]

I think have my first grow nearing the end but over the last week or two I've slowly had the leaf tips and now edges turning purple. I do some some thrips on the plant but what would the purpling be?
Is this just normal fade and should I feed to overcome it?

It's Gorilla Girl Scout in a ~8 gal pot, on day 74. Pack says 90 days.

 

[Nicc]

I would not worry about it, you're nearly there, just don't feed for the last 14 days. Looks normal to me.

 

[Nicc]

If you're temps are low at night that will also turn leaves other colours.