sorry, here's the pic

{{gwi:235676}}

To me it looks like your plant was touching the lights and got burned. There is no fungal disease that I know of that leaves white spots like that

If there are no aphids or scale on the underside of the leaf then it appears to just be some sort of environmental damage, nothing major. Have they been outside at all? Exposed to direct sun or wind? That is the usual cause. Contact with the light as oilpainter said is a real possibility too.

I'd double check for any pests but if you find now I honestly wouldn't worry about it too much.

Dave

thanks for the responses, I know that they didn't touch the lights because I keep them at 3" to 4" above them, the only thing I'm thinking is that I left the fan on for too long on one day after I water them and the temperature was at 55? I only have 4 of this seedlings with the leaf problem out of the 24 I have growing. I just don't want it to spread if is some kind of virus.

If you are really worried about it, and I tend to get worried:) I would just get rid of the problem ones. Since you have so many anyway, they probably won't be missed.