Hello, I have had my snowflake eel for a little over 2 years now and he’s done absolutely amazing. Recently tho he’s been showing some odd behavior. I recently have had trouble with nitrates in his tank and have aggressively been combating them. I have now gotten them down to 5ppm. However my eel is now sitting out in the open, not moving much, being very skidish when any fish comes near and has stop accepting any and all food which is extremely concerning cause he would eat anything any day up until this point. I have noticed a clue to this mysterious illness and that is that along with not eating and being skidish he is breathing very fast and the out and inside of his mouth is bright red. Any suggestions?