No the mat was placed onto a piece of rock, which is above the substrate. And the roots arent a dark healthy brown. They are like the yellow of hay or dead grass.
Temp is 76.
Could it be the duckweed? Like I said, it is very sparse so I only have a little in the corner. But the current of the tank pushes it to the right side, above the dying fern.
Last edited by karawr; 03-03-2013 at 08:54 PM.