Added a new clownfish to tank yesterday early afternoon, he was doing good. This morning he was breathing very heavily and is letting himself get sucked by return flow. I have another clown which is doing perfectly fine and is showing no signs of stress. All my parameters are good (0 ammonia and nitrite, ph 8.2 nitrate 10-15 temp 78ish salinity 1.024). I really don’t know what’s wrong or what I should do. I added an air stone in case he wasn’t getting enough oxygen but nothing has really changed in the last 2 hours since I added. He hasn’t really lost coloration though so maybe that’s a good sign. What do I do? Could he have some type of parasite? Flukes maybe?