I am a new fish owner, have had my fish tank for only 6 months. It's a 10 gallon tank with 2 panda corrys and 4 female platys. All of my fish have been happy and healthy since I bought them. However, one of my platys is suddenly hiding all the time near the surface behind the heater. She rarely comes out and when she does, acts very skittish and then hides again. It doesn't seem like she's eating. Does anyone know what the problem might be? I don't want to lose her. Is there anything I can do to fix the issue?