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I apologize that no one has responded to your question sooner. Different experts come online at various times. I just came online and saw your question. My name is ***** ***** I’m a biologist with a special interest in fish. I'm sorry to hear of this incident. If you stiill need help, Some additional information will help me figure out the next step for you.
Both the bottom sitting and the reddened fins can be symptoms of ammonia toxicity. Have you tested the water? If so, what numbers did you get for ammonia and nitrites in parts per million? If not, get a test kit that uses test tubes and chemicals you add to water sample. The strips you dip in the water are not accurate.
While you're at the store, also buy some aquarium salt. We may need it regardless of the test result.