Posted: 30/04/2012 at 17:39
The chances are that the roots were damaged when they were dug up - even though you were obviously careful, it's very easy to do. The main thing to do with all of your seedlings is to keep them moist, but not saturated, and make sure that they never wilt. You can also start feeding them with weak liquid feed in a couple of months' time.
Apart from that, you must be doing things right if your acer is thriving.
Good luck, and enjoy gardening