hi everyone ,i have a fire eel he eats well about 6in long but seems to rapidly breath like hes panting is this normal? I have tried to research this but always get conflicting results some people say they naturally breath fast, others say lack of oxygen while others say nitrite/nitrate poisoning well my no2 is 0 i have a heavily planted tank with a dragon goby ,snake fish,2 discus,5 rosy tetras who are all fine.Recently i lost a fire eel who was really tame would feed out of my hand then one day just stopped eating tried everything to get him eating again to no avail he rapidly breathed but every now and then would sneeze [only way i can desribe it] is this related to the other one breathing rapidly.Any help concerning these awesome creatures would be greatly appreciated.