There is a white solid spot on my bichir's head. I touched the spot it is very soldi like salt crystal. It has started two days ago. I dropped Methylene blue to the tank and also directly fish's head yesterday. I checked today and saw that white area increased and also some bloody strains occured. I suspected Columnaris and got Terramycin today. It is not eating so i put some terramycin its head. Its tank mates are wolf fish and emperor snakehead and no bullying. There is no white spot on other fishes. Can somebody help me for exact diagnonsis? Is it Columnaris, fungus or bichir worm?
