Bar gobies, Ptereleotris zebra: common fish are cool too

[youtube width=”680″ height=”400″]http://www.youtube.com/watch?v=Ek75p9golWc[/youtube] We may spend an inordinate amount of time talking about the rarest fish in the hobby, but we’ve got nothing but love for the bread n butter fish that fill the tanks of hobbyists around the world.…