There are more the 2000 saltwater gobies and 200 of these species are found in the aquarium trade. Most marine gobies for the aquarium are small bottom dwellers and grow to no more than three inches, though a few uncommon goby species grow quite large. Most are safe for community fish tanks and reef tanks.
Gobies need rocks to graze and hunt and a sandy substrate to burrow. Just as these fish can hop around the bottom of the fish tank, they can hop out of the fish tank, so a proper top is required for most Saltwater gobies.