Hi, Yesterday I noticed this strange white fluffy ball on the bottom half of our Betta's pelvic fin (? - the skinny red ones at the bottom) on one side. Since it didn't look like something that had attached itself to him but rather was growing on it, I looked it up. I'm not entirely sure, but it seems like it could be this Cotton Fin Fungus. I saw some advice to firstly clean the tank, so he got cleaned out, and in the process that part of his fin has come off, so there's no more evidence of any 'cotton' growths anywhere that I can see. But does this mean he's okay? Is there something I should be doing? I'll attach a picture that I took of him/the fluff before it came off - it's not fantastic quality but hopefully you can see it.