Today I took the tops all the way off the daylily seedlings. There are two more jugs, one with nice healthy seedlings and one in which they have not emerged at all, but this tray would only hold 10 jugs so those other two are conferring elsewhere.
Most jugs I write the names on the top but for these I was foresighted enough to write the parents' names on the bottom part of the jugs. So it was easy to take those tops off and discard them.