1 of 8 identical plants turning yellow. Ideas?

Thanks for reading. Growing 8 White Widow Autoflowers, all identical pots, potting soil, LED lights and nutrients. 1 has been yellowing over the past week, so far the others are healthy. Hoping I don’t have an issue that might be spreading. First two weeks used Ph neutral water, last week started with Advanced Nutrients Grow/Micro/Bloom as per instructions.

Is this a nutrient issue or do I need to cull this plant before it potentially spreads to the other plants? Any feedback appreciated!

Looks like the light may have been too close at one point. New growth looks good.

Thanks, my fears were that I had some type of disease.