My 4 yr old Koi Angel isn't eating. Night before last he looked really sick at the bottom of the 55g tank. The next morning he was swimming okay but staying low in the water and not coming up to the top at feeding time. Today he's still not eating. He tried at particles floating by, but spit out the one bite he took. I don't see any physical symtoms.
All the tank parameters are in healthy range and other fish are fine. This tank has been in operation for over 20 years.
I'm baffled. Please help.
All the tank parameters are in healthy range and other fish are fine. This tank has been in operation for over 20 years.
I'm baffled. Please help.