Seedling with strange mottled foliage - virus?

[ddsack]

That's very odd. The leaves seem to be crinkling up along with the strange mottling. Is it still growing normally otherwise?

I actually liked the first two photos since I'm interested in variegated foliage which often appears at the 2nd or 3rd leaves. But the blotchiness of the your leaf patterns is different than normal variegation. Is the plant getting more spindly and crinkly than it's siblings?

If it were me, I'd just separate it from the other pots and keep watching to see what happens, unless it clearly starts to go downhill. But then, I like to watch the progress of things I haven't run into before.

If you're concerned about it spreading to your other plants, then Marsha has good advice.