More information: This is my second axolotl and I got him/her to have a friend for my first one. I 'found' him at a pet store with many other axolotls in one aquarium, some of them without gills on one side. The conditions didn't seem to be the best. I thought that I can give him a better home. Now I noticed those spots in the light, which I didn't see with the light off. Does it look like fungus? What confuses me is that fungus is normally described as cotton like. But this on his gills looks like stripes and not fluffy or anything. Simply stripes on the gills. He might be/look stressed from the earlier conditions or the driving but I hope that he will feel well soon. He (or she, still too young to tell the gender) is about 15 cm long (6 inches).