Hi, everyone. My Cory has been bracing very oddly for about 2 days and I am increasingly worried about him. He had been alternately extremely lethargic and then frantically swimming around in bursts. His breathing is rapid at times, even when lethargic. No apparent injury. Water chemistry us where it always is. Higher Ph but all else in good range. I do regular water changes on Friday but did one tonight due to worry. He immediately behaved normally again but reverted within 30 minutes to odd behavior. The other occupants are danios and snails, so no symptoms there. I really like this guy! Any one have ideas what to do?