plant wilting

ok so i found some white moss or mold on my plant which is about 1 week old. She is about 6 inches long and not able to hold herself up. Is this to much water. I have her in a simple hydrosetup floating no pump. Is this due to water non movement or is it just mold killing it off due to too much water ?
Or is it bugs I saw like 1 knat flying around. Atleast it looked like a knat ..Also the stalk of the plant is all clearish white not green like it was or brownish. Sorry, no pics dont have a webcam.

Well if u had pictures then we could see if she cant hold herself up due to light being to far away and the plant strectching or if it is from the mold and shit.