The Yellowline Goby is very similar to the Neon Goby, except that it has yellow lines rather than the blue lines of the Neon Goby.
Yellowlines are cleaner gobies, which are always beneficial in aquariums. They also will eat small bits of frozen and dry aquarium foods and are generally welcomed by larger fish because they are recognized as cleaners.
Be sure to check out the Hybrid Cleaner Goby that is produced when this fish mates with a Neon Goby.