I have a group of clown loaches in my 180 gallon tank. 5 are acting totally normal but the biggest (about 10") has been breathing super fast for the past week. Not sure what it could since no other clowns show the same symptoms or any other fish for that matter in the same tank. I already did a water change, but this fish who has never missed a meal in his live actually didn't eat the last time I fed the tank.
quick video I did this morning. He's actually seems to slow down a bit since a few days ago the breathing was even faster. Could it be related to his overweight issue?

quick video I did this morning. He's actually seems to slow down a bit since a few days ago the breathing was even faster. Could it be related to his overweight issue?