Yellow on the lower tip leaves?

Can you let me know what is the cause of the bottom leaf is turning yellow. We water it 1 time a day, and it has 24 hr light. Can you let me know if we can fix this problem because it just started, I have upload a photo of the tip of the Blue Cheese.

stop watering every day. water it well and leave it alone.

Thanks for your help stump I also thought that, but needed another person opinion and someone that knows more about these things.