Is keeping marine fish difficult?

While more water quality management is needed compared to freshwater, starting with hardy species like clownfish or blue-green chromis makes it very manageable for beginners. Stable salinity and temperature are key.

How much do marine fish cost?

Clownfish range from 2,000-5,000 yen, blue tangs from 5,000-15,000 yen, and popular angelfish from 5,000-50,000+ yen depending on species and size.

How long do marine fish live?

Small fish live 5-10 years, while medium species like angelfish can live 10-20+ years. Proper environment and nutrition enable long-term care.

What should I check when buying marine fish?

Check for white spots or injuries on the body, intact fins, and that the fish is eating well. Choosing quarantined specimens gives extra peace of mind.

What equipment is needed for marine fish?

Basic equipment includes a tank, salt mix, refractometer, canister filter or overflow system, heater, and protein skimmer. Starting with a 60cm+ tank is recommended.

Marine Fish Encyclopedia — 80 Species Directory

Encyclopedia of popular marine fish species with care guides, traits, and water parameters.

Featured Marine Fish

Harlequin Tuskfish

All Beginner Intermediate Advanced

Small Hardy Beautiful Yellow Algae eater Reef-safe Reef safe Schooling Peaceful Purple Cleaner Large Tang Marine fish Mouthbrooder

Showing 6 of 80 species

Bicolor Blenny

Ecsenius bicolor

Beginner

Bicolor with brown front and orange rear. Humorous algae-grazing behavior on rocks. Expressive face makes it popular.

Algae eaterHumorousReef-safe

Dottyback

Beginner

Small colorful marine fish. Royal Dottyback is popular. Feisty but small size limits damage potential.

SmallColorfulFeisty

Firefish

Nemateleotris magnifica

Beginner

Small goby with a beautiful white-to-orange-red gradient. Named for the flag-like elongated first dorsal fin. Shy but calmer in pairs. Ideal for reef tanks.

Beginner-friendlySmallReef-safe

Pajama Cardinalfish

Sphaeramia nematoptera

Beginner

Small marine fish with cute pajama-like polka dot pattern. Peaceful, hardy, beginner-friendly. Looks great in groups.

PeacefulBeginner-friendlyReef-safe

Royal Gramma

Royal gramma

Beginner

Beautiful bicolor fish — purple front and yellow rear. Caribbean native. Cave-dweller that peeks from rock crevices.

Beginner-friendlyBeautifulCave-dweller

Six Line Wrasse

Pseudocheilinus hexataenia

Beginner

Small wrasse with six horizontal lines. Beneficial pest controller eating flatworms. Active swimmer adding movement to the tank.

Pest controlActiveSmall

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Marine Fish FAQ

Is keeping marine fish difficult?: While more water quality management is needed compared to freshwater, starting with hardy species like clownfish or blue-green chromis makes it very manageable for beginners. Stable salinity and temperature are key.
How much do marine fish cost?: Clownfish range from 2,000-5,000 yen, blue tangs from 5,000-15,000 yen, and popular angelfish from 5,000-50,000+ yen depending on species and size.
How long do marine fish live?: Small fish live 5-10 years, while medium species like angelfish can live 10-20+ years. Proper environment and nutrition enable long-term care.
What should I check when buying marine fish?: Check for white spots or injuries on the body, intact fins, and that the fish is eating well. Choosing quarantined specimens gives extra peace of mind.
What equipment is needed for marine fish?: Basic equipment includes a tank, salt mix, refractometer, canister filter or overflow system, heater, and protein skimmer. Starting with a 60cm+ tank is recommended.

Marine Fish Encyclopedia — 80 Species Directory

Featured Marine Fish

Bicolor Blenny

Dottyback

Firefish

Pajama Cardinalfish

Royal Gramma

Six Line Wrasse

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Marine Fish FAQ

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