What type of goby would suit the role of simply cleaning the sand and eating any food that falls to the bottom, but stays relatively small that's about the size of a yellow watchman goby. It has to have great coloration and is active. Im not looking for a burrowing one or one that completely changes the sand bed so it is one sided. More like a goby that hops or swims over the sand and sifts sand but doesn't burrow. Would a yellow watchman goby do the job?