All i have a clownfish, standard orange and white thats been around for a year now. I rescently added a black false perculous clown and they have fought for a few days now. The thing is , is that the orange clown has always been fine. Now today after changing my water column from high nitrates, low ph and ick... im noticing that the clown is holding his mouth open constantly like a dog would if he was panting. The clowns breathing seems normal however his mouth is hanging open. Im concerned because this did not happen before. What are some thoughts as to what it could be ? just stress? Is this a symptom for something? doesnt seem to be normal behavior for this particular clown. The black clown seems fine, just stressed from getting picked on. I have a 55G tank.