Are you talking about a yellow clown goby or a yellow shrimp goby? Neither one is known to form a symbiotic relationship with corals or anemones. However, the yellow clown goby will often be seen "pearched" on corals like toadstools. As fluff mention, the yellow shrimp goby will pair with a pistol shrimp. I have a pair in my tank and it is an awesome relationship to watch.