Alex Mustard / Spotlight goby (Gobiosoma louisae) looking out from inside a Yellow tube sponge (Aplysina fistularis), growing on a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands, British West Indies. Car...

Alex Mustard / Glasseye snapper (Heteropriacanthus cruentatus) head portrait with a cleaning Goby (Gobiosoma genie) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Todd Mintz / Sharknose cleaner goby (Gobiosoma evelynae) pair sheltering in hard coral, Netherlands Island, Dutch Antillies, Caribbean

Alex Mustard / Cleaning goby (Elacatinus genie) hovering in mid-water. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

David Fleetham / Sharknose goby (Elacatinus evelynae / Gobiosoma evelynae) cleaning Blue striped grunt (Haemulon sciurus) Bonaire, the Netherlands Antilles, Caribbean.

David Fleetham / Cleaning Goby (Gobiosoma genie) on hard coral, Bonaire, the Netherlands Antilles, Caribbean.

David Fleetham / Sharknose cleaner goby (Gobiosoma evelynae) sitting on the head of a spotted moray eel, (Gymnothorax moringua), Caribbean.

Linda Pitkin / Sharknose goby (Elacatinus evelynae) on star coral Bonaire, Leeward Antilles, Caribbean.

Alex Mustard / Cleaner goby (Elacatinus genie) waiting for fish on a brain coral. North Wall, Grand Cayman, Cayman Islands. Caribbean Sea.

Alex Mustard / Nassau grouper (Epinephelus striatus) cleaned by Cleaner gobies (Gobiosoma genie) and juvenile Spanish hogfish (Bodianus rufus) on a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbe...

Doug Perrine / Blue chromis damselfish (Chromis cyanea) being cleaned by Cleaner goby (Gobiosoma sp), Lighthouse Reef Atoll, Caribbean Sea, Belize.