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Shoal & Stem

Flora & Fauna

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

plant
easy

Roundleaf Lindernia

Lindernia rotundifolia

plantfreshwater

Compact stem plant with small, rounded bright-green leaves. Forms a bushy, dense growth habit that holds shape well without constant trimming. Excellent for filling midground gaps in planted aquascapes.

fish
easy

Royal Gramma

Gramma loreto

fishsaltwater

Arguably the most striking Caribbean reef fish — front half vivid purple, rear half bright yellow. Hardy, peaceful, and reef-safe. Tends to hang upside-down under ledges mimicking its cave habitat.

fish
easy

Salt & Pepper Corydoras

Corydoras habrosus

fishfreshwater

One of the three 'dwarf' corydoras species, C. habrosus reaches just 3 cm and has a distinctive row of dark blotches along its flanks. It is more active in the midwater than most corydoras and is ideal for nano planted tanks. Groups of 10+ will show confident, exploratory behaviour and make excellent companions for small shrimp.

plant
easy

Salvinia

Salvinia minima

plantfreshwater

Salvinia is a fast-growing floating fern that creates dense surface cover. Its tiny textured leaves repel water, forming a green carpet on the surface. Excellent for nutrient export and providing shade for light-sensitive plants and fish below.

fish
easy

Schwartzi Corydoras

Corydoras schwartzi

fishfreshwater

Schwartzi corydoras has a distinctive pattern of dark spots and a prominent black stripe through the eye. It is an active, peaceful schooling fish that spends most of its time foraging along the bottom. Well suited to soft, acidic planted tanks.

fish
easy

Scissortail Dartfish

Ptereleotris evides

fishsaltwater

Slender, schooling dartfish with a distinctive forked tail and blue-grey body. Best kept in pairs or small groups; will share a burrow. Reef-safe and active in the mid-water column.

fish
easy

Scopas Tang

Zebrasoma scopas

fishsaltwater

Elegant, understated tang ranging from brown to blue-grey with fine markings. Peaceful and hardy. Excellent algae grazer and reef-safe.

algae
easy

Sea Lettuce

Ulva lactuca

algaesaltwater

Bright green, tissue-thin sheets of macroalgae familiar on coastlines worldwide. Fast-growing nutrient exporter and a relished food for tangs, urchins, and rabbitfish. Tolerates a very wide temperature and salinity range. Can become weedy if not harvested — keep export-focused.

fish
easy

Serpae Tetra

Hyphessobrycon eques

fishfreshwater

Serpae tetras are vivid red fish with a distinctive black comma-shaped shoulder mark. They are hardy and bold, but known to be fin-nippers especially in small groups — keep 10 or more to redirect aggression within the school.

fish
easy

Severum

Heros severus

fishfreshwater

Large, deep-bodied cichlid with a friendly temperament for its size. Comes in green, gold, and red colour variants. Often bonds strongly with its keeper and will hand-feed.

shrimp
easy

Sexy Shrimp

Thor amboinensis

shrimpsaltwater

Tiny brown-orange shrimp with white polka-dots and a characteristic upward tail-bob dance. Commonly lives among anemones and Zoanthids in groups. One of the most endearing nano reef invertebrates.

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
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
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

Six Line Wrasse

Pseudocheilinus hexataenia

fishsaltwater

Active and colourful wrasse with six horizontal blue stripes. Pest controller — eats flatworms and small pests. Can be territorial with similar species.

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.

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.

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.

coral
easy

Star Polyps

Briareum spp.

coralsaltwater

Green star polyps (GSP) are one of the most popular beginner corals, forming rapid-spreading mats of bright green polyps. They are extremely hardy, tolerating a wide range of conditions. Their fast growth can become invasive, so placement should be considered carefully.

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.

snail
easy

Stomatella Snail

Stomatella varia

snailsaltwater

Fast-moving, flat-shelled snail that looks more like a slug. Reproduces readily in reef tanks, forming beneficial colonies that graze film algae and coralline. Fish generally ignore them; a great hitchhiker species.

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.

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.

plant
easy

Swamp Hygrophila

Hygrophila costata

plantfreshwater

A robust, fast-growing species native to the Americas with broad, oval leaves and prominent veins. It adapts well to a wide range of water conditions and is commonly found in paludariums and low-tech setups. Produces beautiful purple flowers when grown emersed.

fish
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.