Hello Enzodog,
I have a 54 gallon bow with eight fish, mostly small, including a pair of clownfish and a starry blenny. My starry blenny is my largest fish at about 5". He's (not sure if it's a male or female) really cool fish, he can even change colors. Although he really doesn't do it often. I see his eyes moving when he's looking at me or another fish in the aquarium. He swims at different levels and will rest on various rocks, often pecking algae off of the rocks and glass. He's a tough fish and not one to be bullied but he's no bully either as long as there are no similarities to other fish. I'm not familiar with clown gobies, but I have a yellow watchman goby. My starry blenny pays no attention to the goby. I believe that it would work.