Tomato seedlings didn't make it!

leafless tomato seedlings

I am not sure what happened but my lovely little tomato seedlings are loosing all their leaves! The plants themselves seem to be strongly rooted, but I imagine the 55 degree temperature in the basement was too cool for them.  The broccoli seedlings growing right next to them are just fine. The herbs in the tray behind them are just fine. So, I conclude it was too cool for them.

I've started a few more Romas and some sweet peppers and I'm keeping them upstairs near the AGA to keep them warm.