Hello, I am a new adoptive parent of 2 rather large angel fish (about 5-6 inches in diameter. My husband recently changed tanks and all my fish are doing very well except Agnes one of my angels. She is floating upside down, not eating, has lost the color orange in her eyes. She was able to swim upright then slowly she would end up upside down. This is for the past 36 hours. Now this evening I tried to feed her some bloodworms, which she tried but she also spit them out. At this time she is just lying on the bottom of the tank. Somebody please help me, we are scared we are going to lose her! Also Pete her companion is not eating either. He seems fine except for appetite