yeah try that first, put it in a high current area, or a real dark spot.. but i know one of my feather dusters loves the light, and one hides in a tiny cave with just a touch of light near him, none of mine like alot of water flow. they are soo tiny
the best bet is probably a high current area, they will probably hide most the time and get tired of the current and bail out to some where more desirable
How big is the rock? can you pull out the valonia with some water tweezers i wonder? My rocks grew bubble algae, green hair and the red valonia , i got from here. not sure what im going to do to take care of it . I did get some calupra algae. guess that just goes along with the hobbie ......