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Shoal & Stem

Flora & Fauna

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

shrimp
hard

Shadow Panda Shrimp

Caridina cf. cantonensis

shrimpfreshwater

High-grade Caridina with a reverse panda pattern — black where panda shrimp are white, and white where they are black. Requires the same soft, acidic conditions as Crystal Reds. Collector's shrimp.

fish
easy

Shell Dweller Cichlid

Lamprologus ocellatus

fishfreshwater

Tiny Tanganyikan cichlid that lives inside empty snail shells. Males are larger and guard a harem of shell-dwelling females. Perfect for a dedicated shell-dweller nano tank.

fish
easy

Siamese Algae Eater

Crossocheilus oblongus

fishfreshwater

The Siamese Algae Eater is one of the few fish that will actively consume black beard algae (BBA), making it highly sought after by planted tank hobbyists. It is a streamlined, active fish with a distinctive black horizontal stripe from snout to tail. Unlike the similar-looking Flying Fox, it is a true algae specialist rather than just a grazer. Best kept singly or in groups; young fish are more active algae eaters than adults.

plant
easy

Siamese Temple Plant

Hygrophila corymbosa 'Siamensis'

plantfreshwater

A compact, narrow-leafed variant of H. corymbosa popular in Dutch-style planted tanks. The smaller leaf size makes it easier to fit into midground positions. Very tolerant and undemanding.

fish
medium

Silver Angelfish

Pterophyllum scalare

fishfreshwater

The classic wild-type angelfish with a silver body and bold black vertical bars. Its triangular profile and long trailing fins make it a centrepiece fish. Prefers tall tanks with vertical driftwood or broad-leaf plants that mimic Amazonian floodplains. Semi-aggressive during spawning but generally peaceful with similarly sized tank mates.

fish
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.

fish
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.

fish
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.

fish
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.

plant
easy

Singapore Moss

Vesicularia sp. 'Singapore'

plantfreshwater

Singapore Moss is a fine-leaved aquatic moss with a slightly more organised, fan-like branching structure than Java Moss. It grows into dense mounds on hardscape and creates effective moss walls on mesh. Fast-growing and undemanding, it is a popular beginner moss for aquascaping and a favourite refuge for shrimp and fry.

fish
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.

fish
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.

fish

Snake Chest Endler

Poecilia wingei

fishfreshwater
fish
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.

shrimp
easy

Snowball Shrimp

Neocaridina zhangjiajiensis var. White

shrimpfreshwater

Snowball shrimp are prized for their opaque white coloration and the pearlescent white egg clusters that females carry, which inspired their common name. Like other neocaridina variants they are adaptable and breed freely in established planted tanks. They add a clean, high-contrast element to darker aquascape substrates.

fish

Sodalis Corydoras

Corydoras sodalis

fishfreshwater
plant
easy

Soft Hornwort

Ceratophyllum submersum

plantfreshwater

Soft Hornwort is the more delicate relative of the common Hornwort (C. demersum) with even finer, softer leaves. It floats freely in the water column, requiring no substrate or roots. Grows rapidly and absorbs ammonia and nutrients aggressively. Excellent for cycling tanks, fry tanks, and shrimp tanks where it provides cover and nutrient absorption.

fish
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.

plant
easy

Spiky Moss

Taxiphyllum sp. 'Spiky'

plantfreshwater

Spiky Moss forms distinctively pointed, spiky tufts that radiate outward from attachment points, giving it a starburst appearance. It grows readily on rock, wood, or mesh and is easier to shape than Java Moss due to its tidier, more structured growth habit. Popular in Nature Aquarium styling.

algae
easy

Spirogyra

Spirogyra sp.

algaefreshwater

Bright green filamentous algae with distinctive spiral chloroplasts. In small amounts it's a natural part of the ecosystem and a food source for many invertebrates. Can quickly overtake a tank if nutrients or CO₂ are out of balance. Best controlled by reducing phosphates and manual removal.

fish
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.

fish
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.

fish
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.

algae
hard

Staghorn Algae

Compsopogon sp.

algaefreshwater

Grey-green single strands that branch into antler-like forks — often tangled in plant leaves and filter intakes. Like BBA, it signals CO₂ problems. More responsive to spot-treatment with liquid carbon than BBA. Siamese Algae Eaters will consume it.

plant
medium

Stargrass

Heteranthera zosterifolia

plantfreshwater

Also known as stargrass, heteranthera zosterifolia has compact star-shaped leaf clusters around each stem, creating a distinctive texture unlike most aquarium plants. It branches freely when trimmed and creates lush, dense mid-background clusters under good lighting.

plant
medium

Starhorn / Hygrophila auriculata

Hygrophila auriculata

plantfreshwater

Distinctive for the sharp, spine-like stipules at each node that give it a starfish or thorny appearance. The leaves are narrow and light green. While not commonly seen in the trade, it creates a striking architectural element in natural-style aquascapes.

plant
medium

Staurogyne Repens

Staurogyne repens

plantfreshwater

Staurogyne repens is a compact, low-growing stem plant with small, bright-green, slightly glossy leaves on creeping stems. Unlike most foreground carpet plants it tolerates moderate rather than high light, and does not require CO2 injection — though both improve density and lateral growth. It can be used as a carpeting plant in lower-tech setups or as a foreground bush, making it one of the most versatile and accessible 'carpet' plants for planted aquariums.

fish
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.

fish
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.

plant
easy

String Moss

Leptodictyum riparium

plantfreshwater

A stringy, long-stranded moss with thin, delicate shoots that grow in loose, flowing tangles — giving it a wild, natural look unlike the denser Christmas or Java moss. Often used to create shaggy, overgrown effects on driftwood or as a hiding place for fry and shrimp. Also used in Wabi-kusa style arrangements. Grows faster than many mosses and can be difficult to manage if left untrimmed but is very undemanding.

fish
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.

shrimp
expert

Sulawesi Cardinal Shrimp

Caridina dennerli

shrimpfreshwater

The Sulawesi Cardinal Shrimp is arguably the most stunning freshwater shrimp — a brilliant red body adorned with white spots, from the ancient alkaline lakes of Sulawesi, Indonesia. It is also the most demanding, requiring very warm water, elevated pH, and unique mineral composition mimicking its ancient lake habitat — parameters almost opposite to other Caridina species. It is intolerant of standard aquasoil buffering and must be housed in species-specific setups using Sulawesi mineral salts.

shrimp
expert

Sulawesi Harlequin Shrimp

Caridina spinata

shrimpfreshwater

Stunning white shrimp with deep blue or red spots. Endemic to ancient Sulawesi lakes with unique water chemistry. Requires warm, alkaline, hard water — a true specialist shrimp.

fish
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.

snail
easy

Sun Snail

Clithon corona

snailfreshwater

Tiny nerite with extraordinary spiky protrusions on the shell resembling a crown or sun. Highly variable shell pattern — no two are identical. Excellent algae grazer. A novelty snail beloved by aquascapers.

fish
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.