I had a yellow and a green clown goby had the green for eight months never touched an sps. I bought a yellow about three months ago within two he was nipping corals. I caught him and placed him in my FO tank then the green started to nip, then to consume entire colonies. After a month and 500 dollars in sps with out catching the little f***er I tore down the tank and just rebuilt today.so after thinking I could have cute clown gobies and sps together I just wanted to let anyone else know its not worth the money, time , or lower back pain lol. experiment failed.