Yep. Dead on. He's a citrinus goby. I ended up buying him at a Petsmart. They were unloading fish into a tank riddled with ich and he was about to go in. I couldn't let it happen!
Thanks for the compliments on the rock work! My lfs
has really nicely shaped live rock full of holes, cracks and a healthy amount of flat surfaces. It was actually very clean too but was pretty expensive.