When you got them could you see roots sticking out of the rooting cubes or pucks?

you say you only had them for a day...did you buy them from a reliable source?

my experience with clone's purchased from someone else is when you buy 12 almost always 1 to 2 will die.....usually it because they were not well rooted. It could be that they were under flor's and you put them in your small grow room and they went into shock as it was too much light for them right at the start.

good luck