Check out my fresh water gobies. Caught them myself in Florida canals in Hollywood. These two species were the most common. I am not sure if they have any other gobies in there. But these guys are the only thin I saw. Sorry for the crappy photos. They are pretty hard to photograph. Plus my aquarium is pretty scratched (I got for free from a dumpster).
The goby on the top picture is Lophogobius cyprinoides or crested goby. These gobies are pretty small, not more than 10cm. As the name suggests, they have this interesting crest on top of their head. Males are much more colorful, with lots of orange and black in them.
Two better quality photos of Lophogobius cyprinoides from the internet