Originally Posted by appledust
I've had my fish get both columnaris and fungus (saprolegnia), so judging by your pictures I'm going to say he has columnaris. If it looks like white slimy or fuzzy patches on your fish then it's columnaris. The disease often looks like a fungus so many people get confused. True fungus is actually really distinct; I didn't realize this until it started growing out of a hole on my poor fish. :\ But it will look like a tuft of cotton with straight, white hair-like structures.
This website was extremely helpful for me when dealing with both of these: http://www.americanaquariumproducts.com/Columnaris.html
To treat columnaris I would use a combination of Maracyn 1 and 2. If this fails then see if you can find Furan-2. If I remember correctly it's not sold in Petsmart or Petco; I found it at a local pet store.
Using maracyn 1 with maracyn 2 will simply make the water more toxic.
Jungle Fungus Clear is Furan-2... dunno why its still labled "fungus clear"
(just discovered that Jungle's Ick Clear is actually anti-fungus, I wonder if their parasite clear is a pH controller?!?)
In the future I'd suggest getting kanaplex from big al's online (www.bigalsonline.com
) but be careful and stingy with it, it works better at raised pH and lowered Kh/Gh. Conditions easily managed in a hospital tank with distilled water and a couple grains of baking soda.