I noticed a damsel today has this weird bubble looking thing on the tip of its pectoral fin. It doesn't look like ich, because it looks too big. I've feeding them everything with garlic and they're all eating normal and are fat. Should I be worried? I didn't see him with it yesterday, so it just came on today. I'm paranoid my tang will get it if it is ich. In case it is I hope my tang is healthy enough to fight it off.