I had this Clownfish in my main tank. After I had lost a couple of other clowns I set up a QT tank but only after I already got this little guy. He has been in my Fluval Evo 13.5G tank for about 2 weeks. A couple of days ago he didn’t swim up to eat as he normally does and was hiding under my overpass I created with my live rock. After looking at him he was breathing rapidly. I since then moved him to my QT tank where I had another clown that I was QT before I placed in my main tank.