About a week ago I noticed that my severum has not been eating. He has been shaking his head aggressively during feeding time but still acts interested in food. He also does this ‘burping’ with his mouth. He’s showing no other outward signs of illness in his behavior. I saw that the head shaking is nerve related and a symptom of an issue. Since this has started a week ago, I’ve done several water changes to make sure my parameters are good and have slowed down feeding. I have treated the tank with general cure in hopes that it would help but he is still shaking his head. I’ve used things like Metroplex, Kanaplex, ect.. in the past but am unsure of what the best course of action is if he has an internal parasite. Help please?