Problem w/ new potted Dieffenbachia?

I've had the plant for a little over a week. I had the nursery pot the two seedlings for me w/ standard potting soil in a regular clay pot. Here's the problem: the soil in the pot, all over, appears to be growing gray fur. I assume this is some kind of mold or fungus. What can I do to get rid of it without killing the plant?

Problem w/ new potted Dieffenbachia?
try digging up the top layer, and watering at a different time of day. The if that doesnt work, go back to the nursery and have them either fix it or give you new ones.
Reply:You probably have the soil too wet. Mould etc will not grow on drier soil. Water only when the top half inch of soil is dry. Remove the mould and throw it in a bin.