My tank is almost 2 months old. I started out with live rock then some inverts and bought a pair of percula clowns about a week later. Within a week one clown had a bright pink patch on his body, the colour faded, he stopped eating and died. The other clown seemed fine so 2 weeks later we bought another clown, a firefish, a watchman goby and a sailfin tang. Now the other clownfish from the original pair was dying. He was swimming on his side, in circles, floating sometimes. He wasn't using the fins on the one side of his body, he had lost the colour on his tail. He is dead now. Even this new clown went through a phase of sitting around the bottom. Does anyone know what the problem might be? I drip acclimated them, the ammonia is at 0, nitrate 0, nitrite 0.1, salinity 1.023. I am only having problems with the clownfish...everything else seems very healthy.