Today one out of three of my blue yellow tail damsel fish obtained a mysterious white spot on its back fin. To large to be ick and im thinking its Lymphocystis or some fungal issue. Any ideas? This is a new tank, and after cycling they were put in first. A little over week after adding them I added a cleaner crew(last friday). There is only one spot and the fish acts completely normal. Water checks look good, just looking for some extra help with the ID of this.