At a glance the quick version
Looks how to spot one
Eel-shaped body
A long, eel-like fish that is neither a true goby nor a blenny. Young fish are black with a white stripe along the body; as they grow, the stripe breaks into white bars or spots, giving a 'convict' pattern.213
Personality what they are like
Peaceful toward other fish and best kept in a small group or pair. Adults are quite secretive and like to stay in their tunnels.31
Daily activity how busy a day looks
Juveniles are active by day, swimming in tight schools to feed, while adults spend most of their time inside the burrow.2
Grooming and care the hands-on bits
Provide a sand bed for burrowing and build rockwork on the bare tank floor, because this fish digs enough to unsettle all but the most stable structures. A pair or group should be added at the same time.23
Home where they are happiest
Around 55 to 60 US gallons (208 to 227 L) or more, with a sand-covered bottom for burrows. Saltwater at about 22 to 26 °C, pH 8.1 to 8.4, dKH 8 to 12, specific gravity 1.020 to 1.025. In the wild it lives in shallow lagoons and coastal reefs at about 3 to 30 m.31
Food basics what goes in the bowl
Carnivore in the aquarium. Offer fresh or frozen seafood, mysis shrimp and brine shrimp, about twice a day. Wild juveniles eat plankton.32
Company who they like around
A schooling fish that does well in pairs or small groups introduced together; it has been bred in home aquariums.13
The story where it all began
Pieter Bleeker described the species in 1856. It sits in its own small family, Pholidichthyidae, which holds only two species. The marine biologist Eugenie Clark studied its unusual family life in the Solomon Islands.2
Fun facts for the dinner table
- 1
Despite its names, it is neither a goby nor a blenny but belongs to a family with only two species.2
- 2
Young fish look like the striped catfish Plotosus lineatus, a likely case of mimicry.1
- 3
A school swims so closely that it can look like one large animal.1
- 4
Its tunnel system can reach about 6 m long, and the parents can move around 3 kg of sand in a single day.2
- 5
At night, juveniles hang from the tunnel roof by thin mucus threads.2
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 2023)1
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Engineer Goby. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Salinity checkevery week
- Top-upTop up evaporation with fresh RO water, not salt waterevery day
- Water testevery week
- Water changeAbout 10 to 20% of the waterevery 2 weeks
- Glass cleanevery week
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Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.
- FishBase: Pholidichthys leucotaenia fishbase.seused for distribution, size, depth, habitat, behaviour, IUCN
- Wikipedia: Pholidichthys leucotaenia en.wikipedia.orgused for history, appearance, burrowing, family life, fun facts
- LiveAquaria: Engineer Goby liveaquaria.comused for care, tank size, water parameters, diet
Checked 2026-09-30. Text is written in our own words from these sources.