Yellowing late week 3 of flower! HELP

[Millerzzz]

Hey guys,
Everything had been going good with the grow until the other day I noticed some yellowing coming in on the plant. The leaves are also wilting as well. Any ideas what the problem can be. My temps have been low through flower. 71 degrees f with lights on 65 with lights off. Humidity has been around 35-45%. Have been feeding with GH flora series.

 

[Jack og]

Indica dominant used more nitrogen then available in your soil and or leaf stored. Add calcium nitrate foe about 3 feeding cycle. Why calnit? Plants uptake it faster and greens out without burning