Hi everyone. I am new to owning a Crowntail Betta and he seemed fine the first day I brought him home. But on day two, he started acting lethargic and had lost his appetite. Now he has gone from a stunning blue and red to a very dull, flat color. He just floats at the top of the tank, with his dorsal fin actually sticking out of the water most of the time. He keeps his fins closed up and doesn't show off at all. When he does open them, I've noticed tiny holes throughout them. Can I please get some advice on what to do to save him? Thank you all!