I noticed Frank had some fuzzy stuff on his pectoral fin today. Any idea what it is? I did some googling and it appears to be a fungus, but I'm not sure what. I read it could be ick (though I doubt it), external parasite/fungus or "cotton wool" disease, which sounds really nasty.
here are some pictures:
I put some aquarium salt in his tank for now, I don't have a water test kit so I can't test the waters. He's in a 5 gallon filtered tank and his temp is at 80, he also lives with a small ram snail.
Any help would be great, thank you!