I have 8 tiger barbs in my main tank and I noticed that one of them lost its pectoral fins and its tail fin. I believe the culprit is fin rot because I find it really hard to believe that all the other barbs slowly nibbled all of its fins off. It is the saddest thing to see because this guy cant steer or propel itself in the water and gets left behind by the other tiger barbs. It just swims around in little circles upside down at the top of the tank. Would its pectoral fins grow back with treatment and time? I am sure I can bring it around but would it be able to swim properly? I don't like killing things unless its absolutely necessary but a life spinning around in circles doesn't sound so great. Should I put the little sucker out of misery?