I have a blue Moscow guppy who I have had for 3.5 months the now. He was always healthy and swimming around my 29 gallon tank with my other livebearers. Two days ago he started swimming at the top of my tank with his tail drooping. I have no idea what's wrong with him. He still eats but he doesn't swim around my tank anymore. He just stay at the top. He isn't gasping for air and he has no sympthoms of any illness other than staying around the top and his tail drooping. My water parameters are 0 ammonia, 0 nitrite, and 8 nitrate. I thought maybe he was being bullied so I sat at the back of my room and watched for half an hour. He wasn't nipped or chased by any fish. He just swam at the top of my tank in the same spot while my other fish were completely normal. His poop is normal too. It isn't white or stringy. I am really confused as to what is wrong with him. None of my other fish are sick or acting sick. @emeraldking @Colin_T Maybe you can help? Thanks in advance.
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