Doesn't sound to good then, I have about 80W of lighting on em, the atenic and normal. they are located just below the return so they get a pretty good current flow. and they are halfway up the mount of liferock, so the lighting is a little stronger.
oh well I bought a little piece as a test, the Little piece that I do know is stil alive looks almost like a tiny feather duster just kinda clearish white in color. I've tried them in 3 or 4 locations, higher up close to the lights farther down kinda under a ledge so it wasnt as much light... near the return ... away..... and the other little life growin doesnt seem to matter he spreads out nicely, but no green polyps. a few spots of the purple look like they are turning to a light orangeish brown