Curious what you ended up doing? I have a diamondback goby in a 215g tank with 2 mature clowns, he was bored in the 20g quarantine tank! I had one years ago in a 75g, I think that's the right size, just upgrade to a 75 lol My large tank is in the process of being stocked, 2 Tangs are in quarantine right now, being treated for Flukes...highly recommend quarantining fish now!! I never used to, but I'm glad I started to!
The yellow clown goby is a cool fish, I tried to get one online but it died in shipping I still plan on getting one for my Biocube 16g, which has 2 black and white clowns and a fire shrimp...who may or may not move to the big tank one day.
I didn't realize there were so many pages of answers on this post! I read page 1 when I commented!