I've had my tank set up for a little over a year now. I'm pretty sure from reading about disease and fungus that my guppies now have a fungus. It looks more like white fuzzy patches than saltlike crystals. I've recently introduces two Khulie Loaches to the tank and shortly after, I noticed these patches on a couple of my fish. If I'm not mistaken, the khulie loaches aren't suceptible to diseases, but does anyone know if they can carry fungus or disease? What is the best way to approach this? I have heard a few different things I can do, but I'm not sure what is the best and safest for my fish. I am also keeping 3 neon tetras and a pleco in the tank.