Browning on the bottom fan leaves!!

[Xochill2u]

We just entered the flowering stage 5/21/21. The bottom fan leaf just started to brown. What is thus a sign of and how do I treat it? Jst watered a couple of days ago and gave fox farm buds and bloom.

 

[Reklax]

Hard to tell under blurples but they generally look healthy don’t worry too much about the odd spot on old fan leaves until it has a noticeable spread