By the fourth day you should be able to mist only if they look like they need it and open the vents some.

Are you sure it's a dark mold or is it just some of the leaves turning black and rotting? When a tray gets crowded and the leaves are touching a lot you often get rotting leaves. But that's just leaf tissue composting quickly, not mold. If this is the case, just trim the black part off the leaves, the rest of the plant is ok.

PC :smokin: