Hello. Currently treating my tank for columnaris. Couple days ago, noticed this strange glittery spot on the side of one of my harlequin rasboras. Sorry, quality of the picture is terrible, but you should still be able to see the spot. It obviously catches light very easily. What do you think it is, and what should I do about it? Second picture is one I got while trying to get a good shot, and I just felt like sharing it.