Monofin Dartfish
Ptereleotris monoptera
Log in or create an account to add this species to your tanks.
Water parameters
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 Monofin Dartfish
General information
The Monofin Dartfish, also known as the Diamond Dartfish, is a peaceful and hardy species that can reach a maximum size of 4 inches (10 cm) in an aquarium setting. This species is generally recommended for intermediate aquarists due to their skittish nature and specific needs for water quality and tank setup.
Diet & nutrition
The Monofin Dartfish is a carnivorous species that feeds primarily on small meaty foods such as frozen or live brine shrimp, mysis shrimp, and other small crustaceans. They can also be fed high-quality flakes and pellets that are specifically formulated for carnivorous fish. It is important to feed this species several small meals throughout the day rather than one large meal to prevent overeating.
Determining sex
There is no known way to determine the sex of the Monofin Dartfish by physical characteristics.
Breeding & spawning
The Monofin Dartfish is a difficult species to breed in captivity and has not been bred often. They are known to spawn in large groups, with the male guarding the eggs until they hatch.
Diseases
The Monofin Dartfish is generally hardy and not prone to any specific diseases, but they can be susceptible to common aquarium diseases such as ich and bacterial infections if proper water quality is not maintained.
Origination
The Monofin Dartfish is native to the Indo-Pacific region, including the Red Sea, the Maldives, and the Great Barrier Reef.
Cautions
The Monofin Dartfish is generally a peaceful species but can become territorial towards other species that resemble their body shape, such as other dartfish species. They should be kept in a tank with plenty of hiding places to reduce stress and aggression.
Acclimation process
The Monofin Dartfish should be acclimated slowly to their new tank environment to reduce stress and increase their chances of survival. It is recommended to use a drip acclimation method for at least an hour before releasing them into the tank.
All photos
Tap a photo to open the gallery viewer.