So my betta, Bob Buttons, always greets me & comes when I call him. Today he is acting depressed - just hanging out in one corner & not paying any attention to me when I talk to him, etc. When he does finally leave that one corner, he is swimming much slower and acting more lethargic than normal. He doesn't seem injured or bloated, and I can't see anything physically wrong with his body. He ate this morning, and is still taking occasional breaths from the surface, but something is definitely not right. I'm not sure what is wrong & I'm really worried. Any advice would be helpful! Thank you!