Shoal & Stem

Species Catalogue

1,376 species — care guides, community photos, water parameters, and tank-mate compatibility.

plant
intermediate

Araguaia Hygrophila

Hygrophila lancea

plantfreshwater

A compact, small-leafed Hygrophila with needle-like leaves that can take on striking red and pink hues under strong lighting. Ideal for the midground in Iwagumi and Nature Aquarium layouts where space is at a premium. One of the more colourful members of the genus.

fish
intermediate

Archerfish

Toxotes jaculatrix

fishbrackish
10″·55+ gal·group 3+·semi-aggr.
fish
Mmedium

Argentine Pearlfish

Austrolebias bellottii

fishfreshwater
1.5″·10+ gal·semi-aggr.
fish
intermediate

Armatus Corydoras

Corydoras armatus

fishfreshwater
2.5″·15+ gal·group 6+·peaceful
fish
Xexpert

Arowana

Osteoglossum bicirrhosum

fishfreshwater
36″·250+ gal·semi-aggr.
fish
advanced

Arrowhead Puffer

Pao suvattii

fishfreshwater
5″·40+ gal·aggressive
fish
intermediate

Asian Stone Catfish

Hara hara

fishfreshwater
1″·10+ gal·group 4+·peaceful
plant
intermediate

Asian Water Fern

Bolbitis heteroclita

plantfreshwater

Asian relative of the African Water Fern. Smaller with more compact, lobed fronds. Grows attached to hardscape in flowing water.

plant
beginner

Asian Watermoss

Salvinia cucullata

plantfreshwater

Compact Salvinia with hooded, cup-shaped leaves. Smaller than S. minima. Excellent for nano tanks. Fast-growing nutrient sponge.

snail
beginner

Assassin Snail

Clea helena

snailfreshwater
1″·5+ gal·peaceful
snail
beginner

Astrea Snail

Astraea tecta

snailsaltwater
2″·10+ gal·peaceful
fish
intermediate

Atlantic Blue Tang

Acanthurus coeruleus

fishsaltwater
9″·75+ gal·semi-aggr.
shrimp
Mmedium

Aura Blue Shrimp

Caridina sp. (Aura)

shrimpfreshwater
1.25″·10+ gal·group 10+·peaceful
plant
intermediate

Australian Buttercup

Ranunculus papulentus

plantfreshwater

Close relative of Ranunculus inundatus with similar runner-spreading growth. Small clover-like leaves form attractive carpets.

fish
beginner

Australian Rainbowfish

Melanotaenia fluviatilis

fishfreshwater
4″·30+ gal·group 4+·peaceful
fish
beginner

Axelrodi Corydoras

Corydoras axelrodi

fishfreshwater
2″·15+ gal·group 6+·peaceful
fish
beginner

Azure Damsel

Chrysiptera hemicyanea

fishsaltwater
3″·30+ gal·semi-aggr.
plant
beginner

Bacopa Australis

Bacopa australis

plantfreshwater

A compact, small-leaved Bacopa from southern Brazil, producing round to oval light-green leaves on reddish stems. Grows slower and stays shorter than B. caroliniana, making it better suited to midground placement or smaller tanks. Under high light, the stems take on a reddish-orange tint that adds warmth to the scape. One of the most beginner-friendly stem plants available — it rarely melts and grows reliably even without CO₂.

plant
beginner

Bacopa Caroliniana

Bacopa caroliniana

plantfreshwater

Bacopa caroliniana is a robust, easy-going stem plant with rounded, fleshy leaves arranged in whorls along upright stems. Under high light the leaves develop a golden to pale-pink tinge; under low light they remain mid-green. It has a distinctive lemon scent when leaves are crushed. A reliable background or mid-background plant for community tanks and an excellent beginner stem plant that tolerates a wide range of conditions.

plant
intermediate

Bacopa Colorata

Bacopa sp. 'Colorata'

plantfreshwater

Pink-tinged Bacopa that offers more colour than standard green varieties. Rounded leaves with a warm glow under good light.

plant
beginner

Bacopa Compact

Bacopa caroliniana 'Compact'

plantfreshwater

Shorter, denser form of Lemon Bacopa. Tight leaf spacing creates a bushy look without frequent trimming. Very low maintenance.

plant
beginner

Bacopa Japan

Bacopa sp. 'Japan'

plantfreshwater

Fine-leaved Japanese Bacopa with small, paired leaves. Grows more delicately than common Bacopa. Nice midground texture.

plant
beginner

Bacopa Monnieri

Bacopa monnieri

plantfreshwater

A classic beginner stem plant with thick, succulent-looking round leaves arranged in opposite pairs along stiff stems. Growth is slow to moderate, making it easy to maintain shape. It adapts to a wide range of conditions and does not need CO2 to thrive, making it one of the most versatile aquatic plants available.

plant
beginner

Bacopa Salzmannii

Bacopa salzmannii

plantfreshwater

A larger-leaved Bacopa with attractive, broadly oval leaves. Under high light, the foliage develops a beautiful pinkish-purple coloration that makes it a standout mid-ground or background accent. More colourful than B. monnieri and responds well to fertilisation.

fish
intermediate

Bala Shark

Balantiocheilos melanopterus

fishfreshwater
14″·125+ gal·group 3+·peaceful
fish
beginner

Balloon Molly

Poecilia sphenops

fishfreshwater
2.5″·20+ gal·group 3+·peaceful
fish
intermediate

Balloon Ram

Mikrogeophagus ramirezi

fishfreshwater
2″·20+ gal·group 2+·peaceful
shrimp
intermediate

Bamboo Shrimp

Atyopsis moluccensis

shrimpfreshwater
3″·20+ gal·group 2+·peaceful
plant
beginner

Banana Plant

Nymphoides aquatica

plantfreshwater

The banana plant is named for its distinctive cluster of banana-shaped storage roots at the base. It sends up floating leaves and white flowers when mature. It is an unusual, undemanding midground plant that does not require substrate planting — it can float freely.

fish
intermediate

Banded Leporinus

Leporinus fasciatus

fishfreshwater
12″·55+ gal·semi-aggr.
fish
Eeasy

Banded Panchax

Epiplatys fasciolatus

fishfreshwater
1.5″·10+ gal·peaceful
fish
beginner

Banded Rainbowfish

Melanotaenia trifasciata

fishfreshwater
5″·40+ gal·group 4+·peaceful
fish
beginner

Bandit Corydoras

Corydoras metae

fishfreshwater
2″·15+ gal·group 6+·peaceful
fish
beginner

Banggai Cardinalfish

Pterapogon kauderni

fishsaltwater
3.5″·30+ gal·group 3+·peaceful
fish
beginner

Banjo Catfish

Bunocephalus coracoideus

fishfreshwater
6″·20+ gal·peaceful
fish
beginner

Barbatus Corydoras

Corydoras barbatus

fishfreshwater
4″·30+ gal·group 4+·peaceful