Hi mast0318,
Although fridging an axolotl will not harm it, it is generally best not to begin a treatment before you know what the problem is.
From what I can see in the photo, it does not look like a fungus. It kind of seems to me like the filaments have been injured. Is your axolotl kept with other axolotls or fish, etc., that could have bit his gills?
-Eva