I just got two betta fish yesterday, and it appears that they have some health problems. The blue one is Thor, and he seems to have some sort of fungus growing on his fins. It wasn't there yesterday, and I think that it may have developed from poor water conditions at the pet store. The white/almost see-through betta is Gutless, he seems to have fin rot. I think that he may also have some sort of growth around his gills, but I'm not quite sure what it is, or if I'm just being paranoid.