Betta struggling after water change

[SeaBidder]

@Riveroak I'd use this for ammonia and nitrate poisoning. You can find it in fish stores and some pharmacies. Poor little guy, he looks really bad. For treatment, mix 5 teaspoons of methylene blue with 3 gallons of dechlorinated tap water, same temp as his tank. Then, place him in it for no more than 10 seconds, and return him to his tank. Just a heads up, use plastic bowls, not metal. Methylene Blue is safe for aquariums and can help with ammonia and nitrite poisoning.