Well, I got a red tailed black shark on Monday and basically it hasn't eaten anything since I got her. She is really small at the moment, at around 5cm. I've tried flake food, small pellets and larger pellets but she doesn't show an interest in them. She is acting perfectly normal and stays out of the way of the other fish so is not bullied. I keep her in a 58 litre long tank with 2 small opaline gouramis around the same size. Everything is fine(as in pH, ammonia etc.) except the nit. levels were a little high, so I cleaned out the tank and put in some live plants. The temperature is at 26 degrees. Any help or advice appreciated. Thanks.