No - unless it's some stage i've never noticed before... it looks like tiny pieces of very fine thread all over the plants and the top of the soil.
With 2 of the 3 6-packs I uprooted the plants (they're still quite small, a couple of inches tall), shook off most of the potting mix, removed the leaves that were most affected and washed the plant off, then repotted in clean packs with new potting mix; with the other pack I just stirred the top of the soil up and removed the worst leaves. Put them in a clean flat and away from the other stuff and if it comes back I'll probably just discard the plants. Very curious as to what this is, though!
