Good day everyone, about a month ago our male flowerhorn was attacked by his female (we suspected her) and his hole nostril was "gone". Like a big hole that swoled up. We treated with general aid for a couple of days but noticed the situation just getting worse. White hairy stuff which brought me under the impression that it is bacterial infection? So we got Baktopur meds from Sera. Another week passed by and he was almost cured. (just a little hole left slightly larger than what the nostril hole was but colour back to normal and swolling gone) So 2 days after the last treatment i did a 50% waterchange, put the carbon back in the cannister and new filter floss, vacuumed the bottom decently etc etc etc. Did another waterchange a week later. So Sunday we noticed he was not himself. Quite in the corner of the tank the hole time. He did like a sneeze effect and white hairy stuff came out of his nostril. Below his eye on his cheek, it is swolen. So i started the treatment again. Did a 50% waterchange, added Baktopur meds again but also this time i thought to remove him from the tank, and soak the wound with a little salt water on a cotton. Also, i noticed his eyes is black? So my brother in law told me that he thinks it is the Polypterus Senegalus (Birchir i think is the aquatic name) could have been the attacker, apparently they have some kind of a poison or poisonous slime in their teeth.... Is that possible? if not What can this be? How can i treat it if i am treating it wrongly now? The picture attached was from a month ago just before we started treating with Baktopur medication.