There are very few gobies who live in the open water. The wonderful Nemateleotris species belong to this. Gobies are specially suitable to be kept in the marine aquarium due to their small size. Often they also fulfill a special purpose: Some of them keep digging the sand to ensure that it always appears white. Others live together with symbiotic partners which is really spectacular to watch.
Symbiotic gobies and partner gobies
"Most interesting: Symbiotic gobies with partner crabs!"