Here's a couple of threads on RC about clown gobies eating SPS to lay eggs.
http://www.reefcentral.com/vbulletin...threadid=99810
http://www.reefcentral.com/vbulletin...w+clown+gobies
Mine definitely cleared off several areas of the table acro until those areas turned white. Wish I had taken a photo. The Acro just couldn't handle it and completely died overnight one day from RTN I guess. Perhaps if I separate the 2 gobies into 2 different tanks, I'll have better luck.
Nice article on clown gobies this month on ReefKeeping.
http://www.reefkeeping.com/issues/20...hcs3/index.htm