Declivis Butterflyfish

Chaetodon declivis

Saltwater Fish Species Group: Butterflyfish Family: Chaetodontidae

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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 Declivis Butterflyfish

General information

The Declivis Butterflyfish (Chaetodon declivis) is a relatively small and peaceful saltwater fish that can reach up to 6 inches in length. This species is usually found in the coral reefs of the central and western Pacific Ocean. It has a white to yellowish body with black diagonal stripes on its sides, and a yellow tail. The Declivis Butterflyfish is a popular choice for aquarium enthusiasts due to its colorful and striking appearance.

Diet & nutrition

In the wild, the Declivis Butterflyfish feeds on a diet of small invertebrates such as crustaceans, mollusks, and worms. In an aquarium setting, it can be fed a variety of foods including frozen or live brine shrimp, mysis shrimp, krill, and other small crustaceans. It is important to provide a varied diet to ensure the fish receives all the necessary nutrients.

Determining sex

There is no visible difference between male and female Declivis Butterflyfish.

Breeding & spawning

Breeding and spawning of the Declivis Butterflyfish is not common in captivity. It is a pelagic spawner, meaning it releases eggs and sperm into the water column where fertilization takes place. The fertilized eggs hatch into larvae, which will drift in the ocean currents before settling on a suitable habitat.

Diseases

The Declivis Butterflyfish is relatively hardy and not prone to many common diseases if kept in a healthy environment. However, it can be susceptible to parasitic infections, bacterial infections, and ich. It is important to maintain good water quality, provide a balanced diet, and avoid overcrowding to prevent diseases.

Origination

The Declivis Butterflyfish is found in the central and western Pacific Ocean, specifically in the waters of Japan, the Philippines, Indonesia, and Australia.

Cautions

The Declivis Butterflyfish is generally a peaceful fish and can be kept with other non-aggressive species. However, it may become territorial towards other butterflyfish, particularly those of the same genus. It is important to provide adequate hiding places and territories for each fish.

Acclimation process

Proper acclimation is crucial when introducing a Declivis Butterflyfish to a new aquarium. The fish should be slowly acclimated to the new water conditions by floating the bag in the aquarium for about 30 minutes to equalize the temperature. Then, small amounts of aquarium water should be added to the bag over a period of time, allowing the fish to adjust to the new water chemistry.

All photos

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