If yellow is what you're really after here's some options:
Yellow Candy Hogfish (Bodianus bimaculatus), sometimes called a Two Spot Hogfish.
I love mine, slow grower (try to find a small one) and swims in and out of the rocks all day. They are actually wrasses, and wrasses in general are very active fish. You're going to want to make sure that any shrimp that you want in the tank are in the tank before this fish. As they mature some can get aggressive towards shrimp that are added after them. Mine doesn't go near shrimp, etc. Very cool little fish and easy to care for.
Yellow Assessor (Assessor flavissimus)
These fish are really cool as well. Not as active/open water swimmer as a wrasse, but still swim around the rock work all day. They do sometime really cool though: They can swim upside down. It's an adaption that they've learned so that they can hunt for small pods in the rock work. I love watching them swim upside down. The captive bred ones are usually a duller yellow that the wild caught, but both versions have similar personalities. Captive bred are usually easier to get to eat.
