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I'm new to this site and literally have no clue what I'm doing so I really hope this works... I have my 2 goldfish in a 55 gallon tank. One of them, I'm pretty sure is a fantail and the other remains a mystery. Anyway, I have had both of them for a little over 1 year. The past couple of months they have had their dorsal fins down and don't seem to swim as much. The fantail sometimes does this "flapping" thing with his fins. Basically, he moves it up and down rapidly. It looks like he's trying to fly. My other fish occasionally does this too. WHAT DOES THIS MEAN? IS THERE ANYTHING I CAN DO? WATER CHEMISTRY: pH- 7.0 Ammonia- 0 Nitrites- 0 Nitrates- about 5-ish