Why is my Diamond Watchman Goby losing weight despite sifting sand all day?

Sand sifting alone rarely provides enough nutrition in a closed aquarium. You must supplement their diet by target-feeding meaty foods like mysis or brine shrimp directly near their burrow 2-3 times a day.

Will a Diamond Goby jump out of the aquarium?

Yes, they are notorious jumpers, particularly when startled or first introduced. A tightly fitting lid or a fine mesh cover is absolutely essential to keep them safe.

Can I keep two Diamond Watchman Gobies together?

Unless they are a confirmed, bonded male-female pair, keeping two in the same tank usually results in aggressive territorial disputes, often leading to the death of the weaker fish.

Will they bury my corals in sand?

While they do not intentionally harm corals, their habit of sifting sand and spitting it out can result in sand dusting corals placed directly on or very near the substrate. It is best to place sensitive corals slightly higher up on the rockwork.

MarineMarineIntermediate

Diamond Watchman Goby

Valenciennea puellaris

An industrious and beautifully patterned bottom dweller, the Diamond Watchman Goby is highly prized for keeping marine substrates impeccably clean.

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Ideal Conditions

Temperature: 22 – 26 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.02 – 1.025 SG
Adult size: 13 – 17 cm
115 Litres: 115 litres+
Lifespan: 5 – 8 years
Diet: Carnivore
Water flow: Moderate
Preferred setup: Deep, fine sand bed (at least 5 cm) and live rock for burrowing.

About the Diamond Watchman Goby

The Diamond Watchman Goby, scientifically known as Valenciennea puellaris, is a highly sought-after marine fish renowned for its tireless work ethic and striking appearance. Hailing from the vast reefs of the Indo-Pacific, this industrious goby spends its days gulping mouthfuls of sand and filtering out microscopic edible morsels through its gills. Its pale body is adorned with brilliant orange, diamond-shaped patches, lending a subtle yet beautiful splash of colour to the lower regions of the aquarium. They are often the focal point of a bustling reef tank's substrate layer, providing both aesthetic charm and practical utility.

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Where Diamond Watchman Goby comes from

Native range

Indo-Pacific, Red Sea, Great Barrier Reef

Countries / regions

Egypt, Indonesia, Australia, Japan, Fiji

Habitat

Sandy bottoms in clear lagoons and seaward reefs.

Widespread across the tropical Indo-Pacific region, inhabiting shallow sandy flats.

Similar species

Chalk Goby
Valenciennea sexguttata
Orange-spotted Goby
Amblyeleotris guttata
Banded Sleeper Goby
Amblygobius phalaena

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Occupy different levels of the aquarium and have peaceful dispositions.
Great
Banggai Cardinalfish
Pterapogon kauderni
Peaceful mid-water swimmers that will completely ignore the bottom-dwelling goby.
Great
Yellow Tang
Zebrasoma flavescens
Herbivorous grazers that pose no threat and do not compete for benthic food sources.
Great
Yellow Watchman Goby
Cryptocentrus cinctus
Both inhabit the substrate and may clash over territory if the tank is not large enough to provide separate burrow sites.
Compatible with caution
Volitan Lionfish
Pterois volitans
Large, predatory fish that will view the slender goby as an easy meal.
Not recommended

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