I believe I have a cichlid with advanced fin rot and I'm not sure what to do! He's listless, just hanging around the top of the tank and his fins are whitish and ragged. Everybody else in the tank is fine.
There is one big bully that picks on everyone but doesn't appear to be picking on this one anymore?
Not sure if I should quarantine him or treat the entire tank. The biggest tank I have that I could use for quarantine is only 8 gallons.
Specs:
Tank-55 gallon
Temp-75F
PH-7.5
Nitrate-40
Nitrites-0
Ammonia-0
Any help would be greatly appreciated, thank you!