Our clownfish that we have had for over 3 years is acting like he is sick. On it's left side its got some white cotton looking stuff (don't think it's ick but not sure). The other fish in the tank are healthy and no spots. We have recently added some new corals (SPS, LPS, and soft) would it just be stress?? Any suggestions on how I should treat him. He is still eating but just lays on his side in the leather it host in. Thanks.