light green at top 1.5 weeks into flower

Got a girl 1.5 weeks into flowering whos upper section is starting to go lime green while the lower growth is all dark dark green still. pretty new to this so just wondering if this is normal or if i need to adjust my nutes. Healthy otherwise.

Pretty normal. If your changing to bloom nutes your plants are getting less nitrogen. This will show up in new leaves first and will start to become very prevalent in older leaves just before harvest.

sometimes they even turn yellow for a couple of days while in transition... If it stays yellow or real lite green then you might have a problem