i've had 2 clownfish for about 9 days now and the 2 clowns were happy then all of a sudden , the smaller clown stopped eeating like it used to and it's not moving around much. the 2 clowns are the same and are no more than 2 inches long. it also always has gills open and seems to breathing heavy, they are fed flakes and mysis shrimp. tank was cycled . live rock and live samd used. dont know what to do