the white edges look like fin rot but since it is only on the tail fin it could go either way.
Do you have a QT tank available? It might definitely need pristine water conditions to help heal. Possibly a separate medicated tank or a medicated dip.
What are the tank parameters? Ammonia, nitrite, nitrate etc...
Do you have a QT tank available? It might definitely need pristine water conditions to help heal. Possibly a separate medicated tank or a medicated dip.
What are the tank parameters? Ammonia, nitrite, nitrate etc...