After seeming to sort out why my SD's were acting weird, it appears one of them has developed a slightly fuzzy white patch (noticed yesterday). I put in some melafix/pinafix, but I've no real idea what this is. Dare I say it hasn't worsened, but it's hard to say. I've done testing in the water--the GH is high, but all other readings seem fine. We did a 30% water change in the 190L tank on Tuesday. I can't post all the tank specifics at the mo, but can in a bit if it will help. I'm just looking for a starting spot with what this may be.
Thanks in advice for any help/ideas.