Domino Damsel

Dascyllus trimaculatus

Saltwater Fish Species Group: Damsel Family: Pomacentridae

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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 Domino Damsel

General information

The Domino Damsel is indigenous to the Indo-Pacific region. With the presence of three white spots, it is also named as three spot Dascyllus. As these fishes get mature they become more aggressive to other tank inhabitants. Also, the Domino Damsel are very hardy and can tolerate extreme conditions which might kill other inhabitants. The Domino Damsel is almost black with three white spots, out of which one is on each side of the middle back and one is on top just before the dorsal fin. It is a striking fish and makes a great addition to any reef tank. Being aggressive in nature, it is advisable to keep the Domino Damsel singly and not in pairs. Should be introduced to your tank as the last fish to ignore its territorial nature. The Domino Damsel is reef safe and will not harm any corals. They should never be kept with few animals such as sharks, rays, large species damselfish, moray eels, and groupers. Instead, the Domino Damselfishes are very safe to keep with dwarf angelfish, puffers, and cardinalfish. There is no distinct characteristic that differentiates male from female Domino Damselfishes.

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