I had a cichlid with these holes, only one sunshine peacock, and I treated with metroplex and after a couple weeks sunshine was back to normal. Checked my tank today and quite a few fish now have the white scars. Before I start treating would like some others advice as to what this is and is metroplex the best treatment and how do I get it to stop reoccuring in the tank. All levels (nitrates, ammonia etc. exactly where they should be and do regular water changes, its a well cycled tank. Any other questions though please ask.