You know what is another very good genus of tiny marine gobies?
The genus Tryssogobius!
Also known as the Fairy Gobies, which is both apt and adorable, or sometimes as the Tiny or Blue-eyed dartfish. These are gobies though. True gobies to be exact (in the subfamily Gobiinae).
These guys are also very diminutive, ranging in size from 2-3 cm in total length. Another fish on my dream team nano fish wish list, fairy gobies do occasionally pop up in the aquarium trade.
Urocyon's Jaunts 2.0 