Hello Can anybody tell what this is? It started a few months ago.. I can't remember when. There was a blue area on her anal fin when I got her, and it got bigger and it turned into a small lump on both sides of her fin and now it looks like this. Her fin started very slowly rotting in that area. There's also some white. What is it? Right now she is in a 10 gallon tank with 7 neons, a 1 1/2 inch BN pleco and a ghost shrimp. I know it's overstocked. It's only temporary. They were all in a 20 gallon but it leaked and the stand was damaged. So I have to buy a new tank and stand. It's taking a while... I will be getting the stand and tank in the next couple of days. And I will move all the fish except the betta once the new tank is ready. Then I can take care of her fin. It's so hard to get a good picture of her!