| Jay,
It's hard to say what's causing him to scratch. They do get "itchs" they need to scratch now and then. Watch him and let us know what, if anything, shows up. Do you happen to have a UV on the system?
Dick
__________________ Amphibious Reaching my 70th BD, I realize that I cannot help but grow old. However, I refuse to grow up!!! My wife would tell you, "He may be 70 but, He's going on 17". Life is wonderful with a woman like that. Our web site The Cultured Reef Our Talking Reef Forum The Cultured Reef Forum My tank journal Amphibious' 135 mixed reef. The Cutured Reef toll free number - 888 745-0449  Amblyeleotris randalli commonly called Randall's Goby. | 
