Diamond Watchman Goby

• ExerciseModerate

  An active swimmer that appreciates open swimming space.

• GroomingAttentive tank care

  Sensitive to water quality — stay on top of testing and maintenance.

• Living spaceNano-tank friendly

  Happy in a small, stable, well-filtered tank.

• Owner experienceSome experience helps

  A little know-how makes life smoother.

• Commitment3–6 years

  Plan for a long, loving relationship.

Health to watch: Ich (white spot) · Parasites · Nutritional deficiency

The Diamond Watchman Goby (Valenciennea puellaris) is an Indo-Pacific sleeper goby reaching about 13 to 15 cm. Despite the trade name it does not partner with pistol shrimp; it is a sand sifter that scoops mouthfuls of substrate, filters out edible organisms and expels the clean sand, keeping the surface of a sand bed turned and bright. It needs 200 litres or more with a deep bed of fine sand, at 24-27C, salinity 1.024-1.026, pH 8.1-8.4, and a covered top. The honest difficulty is nutrition: many specimens slowly starve in tanks whose sand does not hold enough micro-fauna, so a mature system matters, and it must also be trained onto mysis, enriched brine and sinking pellets fed two or three times daily. Watch its belly profile as the real health indicator. It is peaceful and reef safe, but it will bury the bases of low corals under sand and should not share a tank with another sand-sifting goby.

• How active is a Diamond Watchman Goby?

  Moderate. An active swimmer that appreciates open swimming space.

• How much maintenance does a Diamond Watchman Goby need?

  Attentive tank care. Sensitive to water quality — stay on top of testing and maintenance.

• What tank size does a Diamond Watchman Goby need?

  Nano-tank friendly. Happy in a small, stable, well-filtered tank.

• Is a Diamond Watchman Goby a good fit for first-time owners?

  Some experience helps. A little know-how makes life smoother.

• How long do Diamond Watchman Goby live?

  3–6 years. Plan for a long, loving relationship.

• What health issues affect the Diamond Watchman Goby?

  Keep an eye out for Ich (white spot), Parasites, Nutritional deficiency. These are worth raising with your vet, along with any screening they recommend.

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