Pygmy Angelfish

Centropyge argi

Saltwater Fish Species Group: Angel Dwarf Family: Pomacanthidae

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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 Pygmy Angelfish

General information

The Pygmy Angelfish it is a brilliant sapphire-blue with orange highlights to the face. The Pygmy Angelfish should have numerous hiding places and live rock for grazing on microalgae. It may nip at large-polyped stony corals and clam mantles. The Pygmy Angelfish is an aggressive little angelfish, so it is best to never have more than one male per tank, since they may fight to the death. A breeding pair may be kept.

Diet & nutrition

Pygmy angelfish is an omnivorous marine angelfish feeding on a variety of marine algae. This species can readily feed on frozen and prepared foods in an aquarium. Diet must consist of varied food items such as frozen mysis shrimp, spirulina, nori and detritus in the aquaria. Feeding must be done frequently if no natural sources are available in the tank.

Determining sex

Color does not determine the sex of Pygmy angelfish, like other Centropyge, this species are born females. The larger and more dominant fish will become male and the others will remain female. If the male dies, the next in command in the hierarchy will turn to male.

Breeding & spawning

Species belonging to the genus Centropyge are broadcast spawners, relasing eggs and sperm simultaneously at dusk by rising into the water column and relasing the gametes at the top of the aquaria. A tall tank with proper lighting schedule which mimics the species natural environment is needed to encourage spawning in an aquarium setting. The eggs hatch in just under a day. After hatching, within 2 to 3 days, they need microscopic algae for their very small mouths.

Diseases

Dwarf angelfishes such as the Pygmy angelfishes are susceptible to diseases such as White Spot Disease, Velvet Disease, and bacterial infections when tank conditions are not kept at an opmtimum range. Parasites may cause scratching and flashing behavior of the affected fish which usually culminates to numerous white dots on the skin (White Spot Disease) or a peppery coating leaving a yellow to light brown "dust" on body (Velvet Disease). A secondary infection from these parasites may lead to bacterial infections which can kill the fish within days.

Origination

The Pygmy angelfish are native to the waters of the Caribbean and Gulf of Mexico, north to North Carolina.

Cautions

This species prefer reef tanks over fish only tanks but caution is recommended when adding this fish to a coral tank since they are observed to be nipping on sessile invertebrates such as corals and clam mantle. It is also quite aggressive and should not be housed with other Angelfish unless they are bonded pairs. It is observed that male saengelfish when kept together will fight to the death.

Acclimation process

This pygmy angel should be provided with plenty of rubble type areas to pick natural foods from and with several little caves in the rock work to hide in to feel secure. These species favor an established reef environment with plenty of nooks and crannies to graze for food.

All photos

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