I have a High Fin Batfish aka Banded shark that has become inactive with labored breathing.?

Question

The other fish appear to be fine and there is good aeration.

The tank is 55 gallons. There is another High Fin Batfish, Two Plecos, and Four Goldfish. I don't have the chemical readings but the water has been kept clean and clear with regular changes and treatments.

Answer 1

What size tank is it in? What other fish is it with? What are your ammonia, nitrate, nitrite readings? I need to know these before I can help.