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Shoal & Stem

Flora & Fauna

673 entries — care guides, placement tips, and notes from the community

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easy

Silver Dollar

Metynnis argenteus

fishfreshwater

Large, disc-shaped silver fish that schools impressively in groups. Voracious herbivore — will demolish live plants. Best kept with hardy tankmates in a spacious aquarium.

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medium

Silver Hatchetfish

Gasteropelecus sternicla

fishfreshwater

Unique keel-shaped body adapted for surface dwelling. Can leap out of water to escape predators — a tight lid is essential. Prefers surface insects and small live food.

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easy

Silvertip Tetra

Hasemania nana

fishfreshwater

The silvertip tetra gets its name from the bright white or silver tips on every fin, which flash attractively as the fish moves. Males have a warm orange-copper body colouration while females are more silvery. It is a very active, somewhat nippy species that is best kept in large schools of 10 or more to distribute any fin-nipping behaviour.

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easy

Similis Corydoras

Corydoras similis

fishfreshwater

Similis corydoras is a small, attractively spotted species with a distinctive dark spot at the base of the tail fin. Peaceful and active, it mixes well with other calm community fish and is hardier than many of its relatives.

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easy

Skunk Corydoras

Corydoras arcuatus

fishfreshwater

The skunk corydoras has a distinctive arched black stripe running from snout to tail over a pale body, resembling a skunk's marking. It is a peaceful, active bottom-dweller that does well in soft, slightly acidic water with fine sand substrate.

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easy

Smiling Cichlid

Laetacara curviceps

fishfreshwater

Small, peaceful cichlid with iridescent blue-green scaling and an expression resembling a smile. One of the best cichlids for planted community tanks — rarely aggressive and plant-safe.

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Snake Chest Endler

Poecilia wingei

fishfreshwater
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medium

Snakehead Betta

Betta channoides

fishfreshwater

Betta channoides, the Snakehead Betta, is a mouthbrooding wild betta from East Kalimantan, Indonesia, named for the slightly flattened, elongated head profile reminiscent of snakehead fish. Males and females display striking orange-red coloration with dark scale edges. Like other mouthbrooders it is less belligerent than bubble-nesters, and well-conditioned pairs can coexist in adequately sized planted tanks.

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Sodalis Corydoras

Corydoras sodalis

fishfreshwater
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easy

Sparkling Gourami

Trichopsis pumila

fishfreshwater

The Sparkling Gourami (Pygmy Gourami) is a tiny, jewel-like labyrinth fish barely 4 cm long whose body glitters with iridescent blue-green spots. It produces a distinctive chirping or croaking sound during spawning, which is audible outside the aquarium. Its diminutive size makes it perfect for nano tanks with fine-leaved plants; it should not be housed with boisterous or much larger tankmates.

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easy

Splendid Rainbowfish

Melanotaenia splendida

fishfreshwater

The splendid rainbowfish is a large, hardy, and adaptable species that comes in several regional colour forms varying from blue-green to reddish-orange. Males develop a deep body profile and bold colouration. It is a robust, undemanding fish that tolerates a wide range of water conditions, making it popular with beginner rainbowfish keepers.

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easy

Spotted Blue Eye

Pseudomugil gertrudae

fishfreshwater

Tiny blue-eyed rainbowfish with yellow fins spotted with black. Gorgeous in groups in a heavily planted nano tank. Males display with raised fins in bright iridescent colours.

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moderate

Spotted Blue Eye Rainbowfish

Pseudomugil gertrudae

fishfreshwater

A tiny jewel of a fish, the spotted blue eye has vivid spotted fins and stunning iridescent blue eyes. Males display spectacular finnage with yellow and black markings during courtship. At just 3–4 cm it is ideal for nano tanks and looks magnificent in a heavily planted setup. It prefers soft, slightly acidic to neutral water.

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easy

Sterbai Corydoras

Corydoras sterbai

fishfreshwater

Sterbai corydoras are distinctive bottom-dwellers with a bold spotted pattern and bright orange pectoral fins. Unlike many corydoras they tolerate warmer water, making them suitable tankmates for discus and other warm-water species.

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medium

Strawberry Betta

Betta albimarginata

fishfreshwater

Betta albimarginata, the Strawberry Betta, is a small mouthbrooding wild betta from Borneo distinguished by its deep red body, white-edged fins, and the characteristic white lip border that gives it its species name. Males incubate eggs orally and are typically less aggressive than bubble-nesting bettas. They do best in densely planted species tanks or carefully managed community setups with non-nippy tankmates.

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easy

Striped Raphael Catfish

Platydoras armatulus

fishfreshwater

Armoured catfish with striking black-and-white stripes. Nocturnal and peaceful. Known to produce audible grunting sounds. Hardy and long-lived — can reach 20+ years.

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medium

Sumo Loach

Schistura balteata

fishfreshwater

Compact, boldly marked loach with dark bands on a tan body. More territorial than other loaches — keep with fish that can hold their own. Active and entertaining to watch.

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medium

Surinam Eartheater

Geophagus surinamensis

fishfreshwater

Large cichlid that sifts sand through its gills for food particles. Peaceful despite its size. Needs a deep sand bed and pristine water quality.

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Surinamensis Corydoras

Corydoras surinamensis

fishfreshwater
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medium

Swamp Guppy

Micropoecilia picta

fishfreshwater

Striking livebearer with vivid red, black, and yellow patterning on males. More delicate than standard guppies and prefers brackish to soft freshwater conditions.

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easy

Swordtail

Xiphophorus hellerii

fishfreshwater

The Swordtail is named for the dramatically elongated lower caudal fin lobe of males, which can equal or exceed body length and is used in courtship displays. Available in numerous cultivated colour forms including red, orange, green, and black, it is a hardy and active community fish. Males can become aggressive toward each other, so limit the ratio of males per tank or keep a single dominant male.

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Sychri Corydoras

Corydoras sychri

fishfreshwater
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medium

Threadfin Rainbowfish

Iriatherina werneri

fishfreshwater

The threadfin rainbowfish is a delicate, striking fish with males displaying long, flowing finnage tipped in vivid colour. It is a micro-predator that requires calm water and very small live or frozen foods. Best kept in species tanks or with the smallest, gentlest tankmates.

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medium

Three-lined Pencilfish

Nannostomus trifasciatus

fishfreshwater

Elegant pencilfish with three distinct horizontal stripes and vivid red markings on the fins. Peaceful and slow-moving — ideal for low-flow planted tanks. Best in groups of 8+.

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medium

Three-stripe Dwarf Cichlid

Apistogramma trifasciata

fishfreshwater

Stunning apisto with brilliant iridescent blue and red markings. Males are notably elongated and display vivid colour during spawning. Peaceful for a cichlid and works well in planted community tanks.

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easy

Tiger Barb

Puntigrus tetrazona

fishfreshwater

Tiger barbs are energetic, striking fish with four vertical black stripes on a golden body. They are notorious fin-nippers when kept in small numbers, but large groups of 8 or more redirect aggression within the school and become safer community fish.

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hard

Tropheus

Tropheus moorii

fishfreshwater

Lake Tanganyika herbivore with dozens of stunning colour morphs by location. Requires a strict plant-based diet — meaty food causes deadly bloat. Best kept in large colonies of one morph.

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moderate

Tukano Corydoras

Corydoras tukano

fishfreshwater

One of the most beautiful and sought-after corydoras, C. tukano has a vivid blue iridescent body with a striking orange-red stripe running from the nose to the dorsal fin. It is a blackwater species requiring very soft, acidic water and thrives in species tanks replicating its natural biotope with leaf litter and tannin-stained water.

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easy

Turquoise Rainbowfish

Melanotaenia lacustris

fishfreshwater

The turquoise rainbowfish has an intense blue-green iridescence across its body that intensifies at peak colour. It is a larger, robust rainbowfish that does best in spacious tanks with good filtration. Males colour up brilliantly in well-maintained setups.

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hard

Twig Catfish

Farlowella acus

fishfreshwater

Remarkable camouflage artist that looks exactly like a twig or dead stick. Grazes algae and biofilm off surfaces. Sensitive to water quality — requires pristine, well-oxygenated water.

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medium

Umbrella Dwarf Cichlid

Apistogramma borellii

fishfreshwater

Cool-water dwarf cichlid with a yellow body and blue iridescence. Cooler temperature preference than most apistos. Peaceful and excellent for planted tanks.

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easy

Upside-Down Catfish

Synodontis nigriventris

fishfreshwater

Fascinating catfish that swims inverted to feed on the underside of leaves and wood. The inverted posture causes its belly to be darker than its back — the reverse of most fish.

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medium

Veil Angelfish

Pterophyllum scalare

fishfreshwater

A captive-bred variety with dramatically elongated, veil-like fins on the dorsal, anal, and caudal fins. The flowing fins are visually stunning but more delicate — avoid housing with fin-nipping species. The veil gene can be combined with any colour morph (silver, koi, marble, etc.).

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easy

Venezuelan Corydoras

Corydoras venezuelanus

fishfreshwater

Venezuelan corydoras is similar to the bronze corydoras but displays more orange-red colouration on the pectoral and dorsal fins, especially in males. It is hardy, adaptable, and makes an excellent beginner corydoras.

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medium

Venustus Cichlid

Nimbochromis venustus

fishfreshwater

Striking Malawi hap with a giraffe-spotted pattern. Males develop a vivid blue head. A crafty ambush predator that lies still pretending to be dead to lure prey. Best with other large Malawi haps.

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easy

Vietnamese Cardinal Minnow

Tanichthys micagemmae

fishfreshwater

Closely related to the White Cloud Mountain Minnow but with more vivid colouring — bright red stripe and neon fins. Smaller and more delicate. Excellent for cool, planted nano tanks.