Seedling slightly yellow leaves

Hi, my seedlings :seedling: seem to be doing well, I’ve put them under lights. One of them has a bit of yellow on the edges. It has been cold in the evenings, just got a heater. Any ideas ?
See photo. Thanks

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Hard to see anything with the grow lights on. If possible take a pic with natural light or with flash from camara.

I think it’s fixed itself up, looking better now. Maybe it was the cold. It was getting down to about 5 Celsius overnight. Got my heater worked out now