Am not sure why my clownfish always hangs out at the bottom of the tank, and only opens and closes his mouth often. It rarely swims to the other end of the tank. I even find its color a bit faded. Is it really sick or is that the way they behave?
Do you know how long that is has been like this by chance? Have you tested any of the water parameters, and if there are any other fish in the tank, are they showing similar symptoms or are they still looking healthy?
From my understanding, this is nothing to worry about if it happens now and then but if the fish has been like this for days, it can be sick. Either sick from poor water quality or eating something it shouldn't have.