Longspine Cardinalfish

Zoramia leptacantha

Saltwater Fish Species Group: Cardinalfish Family: Apogonidae

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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 Longspine Cardinalfish

General information

The Longspine Cardinalfish is a small saltwater fish species found in the Western Pacific Ocean. They have a silver body with black stripes and long spines on their dorsal fin. The average size of this fish is about 3 inches in length, and they are a peaceful species that can be kept in a community aquarium.

Diet & nutrition

The Longspine Cardinalfish is omnivorous and will eat a variety of foods including brine shrimp, bloodworms, and small pieces of fish or shrimp. They should be fed small amounts multiple times a day.

Determining sex

It is difficult to determine the sex of the Longspine Cardinalfish visually.

Breeding & spawning

Longspine Cardinalfish can be bred in captivity, and a mated pair will lay their eggs on a flat surface. The eggs will hatch within a few days, and the fry can be fed small planktonic foods.

Diseases

The Longspine Cardinalfish is generally hardy and not prone to any specific diseases. However, like all saltwater fish, they can be susceptible to parasitic and bacterial infections.

Origination

The Longspine Cardinalfish is native to the Western Pacific Ocean, including areas around Fiji, Tonga, and the Great Barrier Reef.

Cautions

The Longspine Cardinalfish is a peaceful fish species and should not be housed with aggressive tank mates. They can be kept in groups, but care should be taken to ensure they have enough hiding places to reduce aggression between individuals.

Acclimation process

When introducing the Longspine Cardinalfish to a new aquarium, it is important to acclimate them slowly to prevent shock. They should be drip acclimated for about an hour before being introduced to the tank.

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