Anna’s narration provides all the story this post needs, but if you want to read more about these twinspot gobies, head on over to blennywatcher.com.  This footage reminds aquarists that fish are much more interesting when kept in natural social groups and appropriate environments.  That said, S.biocellatus is one of those species best left in the ocean because they fare poorly in captivity unless you have a large, mature aquarium with very fine sand brimming with infauna (copepods, amphipods, worms, etc).