Four Eyed Butterflyfish
Chaetodon capistratus
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 HydrogenMeasuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.
NO3 1-20 ppm NitrateWhile 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 NitriteIt is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia
PO4 0.01 - 0.1 ppm PhosphateIt is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.
NH3 <0.1 ppm AmmoniaIt is the primary killer of aquarium fish, causing gill damage, stress, and death
Ca 380 - 450 ppm CalciumSupporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae
KH 8 - 12 dKH AlkalinityIt acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.
Mg 1200 - 1400 ppm MagnesiumIt 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 SalinityEssential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals
ORP 250 - 400 mV Oxidation-Reduction PotentialA higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.
About Four Eyed Butterflyfish
General information
The Four Eyed Butterflyfish (Chaetodon capistratus) is a small, colorful saltwater fish that typically grows to be around 4 to 6 inches (10-15 cm) in length. They have a distinctive black spot on their dorsal fin, and two black spots on their anal fin, giving them their common name. This species can be kept in a community aquarium with other non-aggressive species.
Diet & nutrition
In the wild, Four Eyed Butterflyfish feeds on a variety of small invertebrates such as crustaceans, polychaete worms, and coral polyps. In an aquarium setting, they can be fed a varied diet of frozen or live food, such as brine shrimp, mysis shrimp, krill, and chopped seafood. It's important to feed them multiple times a day since they have a fast metabolism.
Determining sex
Determining the sex of a Four Eyed Butterflyfish can be difficult since they do not have any distinct differences in color or fin shape. However, in some cases, females can be slightly larger than males.
Breeding & spawning
Breeding Four Eyed Butterflyfish in an aquarium setting is not common due to their highly specialized needs. In the wild, they typically spawn in pairs and lay their eggs on coral or rocky substrates.
Diseases
Like many saltwater fish, Four Eyed Butterflyfish are susceptible to parasitic and bacterial infections. Ich and marine velvet disease are common ailments that can be prevented by ensuring proper water quality, a healthy diet, and quarantine procedures for new tankmates.
Origination
The Four Eyed Butterflyfish is native to the Western Atlantic Ocean, ranging from Florida to Brazil, including the Caribbean Sea.
Cautions
Four Eyed Butterflyfish can be aggressive towards other fish, especially other butterflyfish. It's important to keep them with non-aggressive species or only keep one in a tank.
Acclimation process
When introducing a Four Eyed Butterflyfish to a new aquarium, it's important to acclimate them slowly. This involves floating the fish in a bag in the aquarium for 30 minutes to an hour to allow for temperature adjustment. Gradually add small amounts of aquarium water to the bag every 10-15 minutes to allow the fish to adjust to the water chemistry of the new tank.
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