Court Jester Goby

Amblygobius rainfordi

Saltwater Fish Species Group: Gobies Family: Gobiidae

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Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Court Jester Goby

General information

The body is green and blue with horizontal orange stripes running the entire length of the body. The Court Jester Goby is very timid and peaceful and is a great addition to the reef or fish only aquarium. It should be kept in an aquarium that is well-established and has live rock and sand on which the fish can graze. It is best to keep only one of this species in an aquarium unless the tank is large with an abundance of hiding places. It is rarely aggressive towards other species. It is possible for the Court Jester Goby to spawn successfully in an aquarium.

Cautions

Gobies are considered jumpers make sure your aquarium has a tight-fitting canopy or screen cover to prevent the Gobie from jumping out of your aquarium. Gobies have been known to jump through the smallest of holes in a canopy. 

Cautions

Gobies are considered jumpers make sure your aquarium has a tight-fitting canopy or screen cover to prevent the Gobie from jumping out of your aquarium. Gobies have been known to jump through the smallest of holes in a canopy.

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