15 Gallon Standard
A fantastic, often overlooked size that provides a two-foot swimming lane for active nano fish without the height of a 20-gallon.
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A fantastic, often overlooked size that provides a two-foot swimming lane for active nano fish without the height of a 20-gallon. With a capacity of 57 litres (15 gallons) and dimensions of 61 x 30 x 30, this standard tank is compatible with 49 species in our database — giving you plenty of options for a thriving community setup.
Stocking Tips
- 💡Choose one centrepiece fish and build your community around it. Avoid multiple territorial species in a tank this size.
- 💡A good filtration system rated for 1.5× your tank volume helps maintain stable water quality.
Stocking Recipes
Pre-built species combinations that work well together in this tank.
Peaceful Community
- Black Skirt Tetra×1Centerpiece
- Chili Rasbora×6Schooling
- Bee Shrimp (Crystal Red / Black)×10Bottom Dweller
Bold & Beautiful
- Black Skirt Tetra×1Centerpiece
- Clown Killifish×4Schooling
- Scarlet Badis×1Bottom Dweller
Nano-Friendly Mix
- Chili Rasbora×6Schooling
- Bladder Snail (Pest Snail)×1Bottom Dweller
Low Maintenance Setup
- Chili Rasbora×6Schooling
- Thai Micro Crab×3Bottom Dweller
Schooling Showcase
- Chili Rasbora×6Schooling
- Cherry Shrimp×6Bottom Dweller
Colorful Community
- Clown Killifish×4Schooling
- Rachov's Killifish (Annual)×1Bottom Dweller
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Commonly Mis-Stocked
These fish are frequently added to this tank but may outgrow it or cause problems. Proceed with caution.
Amazon Puffer requires at least 75cm of swimming length, which is 23% longer than this tank's 61cm.
Bladder Snail (Pest Snail) fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Cherry Shrimp fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Convict Cichlid requires at least 75cm of swimming length, which is 23% longer than this tank's 61cm.
Endler's Livebearer fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Fairy Cichlid (Brichardi) requires at least 75cm of swimming length, which is 23% longer than this tank's 61cm.
Forktail Blue-eye fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Gardner's Killifish fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Ghost Shrimp fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Guppy fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Least Killifish (Heterandria) fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Malaysian Trumpet Snail (MTS) fits this tank now but grows rapidly — monitor closely and be prepared to upgrade.
Centerpiece Fish
Bold, eye-catching species that serve as the focal point of your tank. Typically kept singly or in pairs.
Betta (Siamese Fighting Fish)
Betta splendens
The Siamese Fighting Fish is an aquarium icon known for its labyrinth organ (allowing air breathing) and vivid colors. While hardy, they require heated, filtered water (24-30°C). Males are solitary and fiercely territorial. Females are generally less ornate but can be kept in 'sororities' with strict precautions (minimum 5 females in 75L+).
Black Skirt Tetra
Gymnocorymbus ternetzi
A very hardy, deep-bodied schooling tetra native to South America. They are incredibly popular for beginners but have a reputation as fin-nippers if kept in too small a group. A proper school disperses their internal bickering and largely prevents them from harassing other tank mates.
Bumblebee Goby (Brackish)
Brachygobius xanthozonus
A miniature, bottom-dwelling goby famous for its striking black and yellow stripes. While they are often sold as freshwater fish and can survive in it temporarily, they are highly susceptible to fungal infections in fresh water and truly require a brackish setup (SG 1.002-1.005) to thrive long-term. They are notoriously picky eaters, often ignoring flakes in favor of live or frozen foods (like bloodworms or brine shrimp).
Dwarf Gourami
Trichogaster lalius
A peaceful to semi-aggressive labyrinth fish native to South Asia. Famous for their brilliant metallic blue and red stripes. While generally suitable for community tanks, males are territorial toward each other and similar-looking fish. They are sensitive to water quality and prone to Iridovirus if stressed. Requires access to the surface to breathe.
Gardner's Killifish
Fundulopanchax gardneri
A stunning, semi-annual killifish native to Nigeria and Cameroon. Known for being relatively hardy and an excellent 'beginner' killifish. They are notorious jumpers and require a tightly fitting lid. While they can be kept in community tanks with similarly sized, fast-moving fish, males can be boisterous and territorial.
Mexican Dwarf Crayfish (CPO)
Cambarellus patzcuarensis
A highly entertaining, fully aquatic dwarf crayfish. In the aquarium trade, the bright orange 'CPO' morph is the most popular. Unlike larger crayfish, they are generally safe with plants and fast-moving mid-to-top dwelling fish. However, they are opportunistic omnivores with claws; they will hunt dwarf shrimp and may nip the fins of slow, long-finned bottom dwellers.
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Schooling Fish
Active swimmers best kept in groups. They bring movement and colour to the mid and upper levels of your tank.
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
A peaceful, active schooling fish native to the Paraguay basin. Known for its striking contrast of a dark black lateral stripe underneath a glowing iridescent white/green-gold stripe. Excellent for community aquariums, particularly in planted setups or blackwater biotope tanks with subdued lighting.
Cardinal Tetra
Paracheirodon axelrodi
A stunning schooling fish native to the upper Orinoco and Rio Negro basins in South America. Famous for its brilliant iridescent blue line and a vivid red stripe that extends the full length of its body (distinguishing it from the Neon Tetra). They are strictly schooling fish that thrive in warm, acidic blackwater environments.
Chili Rasbora
Boraras brigittae
A striking, deeply red nano fish native to the blackwater streams and peat swamps of southern Borneo. They are extremely peaceful and require a mature, densely planted aquarium with soft, acidic water. Due to their tiny size, they are completely safe with adult dwarf shrimp and are ideal for nano setups.
Clown Killifish
Epiplatys annulatus
A striking nano killifish resembling a tiny rocket. Native to West African swamps, they have distinct black and yellow vertical bands. They are strictly surface dwellers (top-level) and are non-annual, meaning they live longer than annual killifish (2-3+ years). They are notorious jumpers and require a tight lid.
Ember Tetra
Hyphessobrycon amandae
The Ember Tetra is a striking, fiery orange-red nano fish native to the Araguaia River basin in Brazil. Extremely peaceful and active, they are perfect for planted and blackwater aquariums. They are tight schoolers and must be kept in groups to feel secure and display their best colors.
Forktail Blue-eye
Pseudomugil furcatus
A highly active, nano shoaling fish native to Papua New Guinea. Recognized by their striking blue eyes and energetic swimming patterns. They are peaceful but require open horizontal swimming space and the company of their own kind to thrive. Due to their short lifespan (2-3 years), they mature quickly and display near-constant courtship behavior.
Bottom Dwellers
Species that inhabit the lower reaches of the aquarium, helping keep the substrate clean and adding activity to the tank floor.
Amano Shrimp
Caridina multidentata
A highly popular, industrious freshwater shrimp renowned for its unmatched algae-eating abilities. Popularized by aquascaper Takashi Amano, they are significantly larger and hardier than most dwarf shrimp (like Cherry Shrimp). They are notorious food-thieves during feeding time and excellent escape artists, requiring a tight-fitting lid. Their larvae require saltwater to develop, so they will not overpopulate in a freshwater aquarium.
Assassin Snail
Clea helena
A highly effective and popular carnivorous freshwater snail used primarily for pest snail control. They actively hunt and consume smaller snails like bladder, ramshorn, and pond snails. Featuring a striking yellow and dark brown spiraled shell, they are a functional and attractive addition to aquariums. Unlike many aquatic snails, they are not hermaphroditic and reproduce quite slowly.
Bee Shrimp (Crystal Red / Black)
Caridina cantonensis
A sensitive, highly prized dwarf shrimp species known for its vivid red/white or black/white banding. Unlike the hardy Cherry Shrimp (Neocaridina), Bee Shrimp require cool, soft, acidic water and typically require active buffering soil to thrive. They are peaceful grazers perfect for specific biotope setups.
Bladder Snail (Pest Snail)
Physella acuta
A tiny, fast-moving freshwater snail almost universally introduced accidentally via live aquarium plants. While frequently labeled a 'pest' due to their rapid, prolific reproduction, they are actually an excellent cleanup crew. They consume algae, uneaten food, and decaying plant matter without harming healthy plants. They are hermaphroditic and can self-fertilize, meaning a single snail can start a massive colony.
Celestial Pearl Danio (Galaxy Rasbora)
Danio margaritatus
A breathtaking nano fish native to small, vegetated ponds in Myanmar. They feature a midnight blue body covered in pearlescent spots with striking red and black striped fins. CPDs are notoriously shy and require heavily planted aquariums to feel secure. Males will constantly display and mock-spar with each other, so a larger group is essential to disperse this behavior.
Cherry Barb
Puntius titteya
A peaceful, schooling cyprinid endemic to the shaded streams of Sri Lanka. Unlike many of its barb cousins, the Cherry Barb is not a fin-nipper and makes an excellent community fish. They thrive in heavily planted aquariums with subdued lighting and leaf litter. Males display a striking cherry-red color, especially during spawning.
Show 17 more bottom dwellers
Other Compatible Species
Additional species that are compatible with this tank size but don't fall neatly into the categories above.
Endler's Livebearer
Poecilia wingei
A tiny, vibrant, and highly active livebearer closely related to the Guppy. Males display intense, neon colors and patterns, while females are larger and plainly colored. They are prolific breeders and require hard, alkaline water to thrive.
Guppy
Poecilia reticulata
One of the most iconic and widely kept aquarium fish. Renowned for their incredible colors, hardiness, and prolific breeding. As livebearers, they give birth to fully formed, free-swimming fry. Males constantly pursue females for mating; therefore, a ratio of at least 2 females per male is strongly recommended to disperse stress.
Honey Gourami
Trichogaster chuna
The smallest and most peaceful member of the Trichogaster genus. Ideally suited for planted nano aquariums. Unlike the aggressive Dwarf Gourami (*T. lalius*), Honey Gouramis are timid and gentle. True Honey Gouramis rarely exceed 5cm. Note: Many bright red fish sold as 'Red Honey' or 'Red Robin' are actually Thick-lipped Gouramis (*T. labiosa*), which grow larger.
Platy
Xiphophorus maculatus
A quintessential community fish known for its durability and massive variety of colors. Native to Central America, Platies are livebearers, meaning they give birth to free-swimming fry. They are peaceful, active grazers that require hard, alkaline water to thrive. They are excellent for beginners but breed prolifically.
Frequently Asked Questions — 15 Gallon Standard
How many fish can I put in a 15 Gallon Standard?
The 15 Gallon Standard (57 L / 15 gal) is compatible with 49 species in our database. The actual number of individual fish depends on the species mix — use the stocking recipes above as a starting point and aim to keep the total bioload below 85% of capacity.
What is the best centrepiece fish for a 15 Gallon Standard?
Popular centrepiece options for this tank include Betta (Siamese Fighting Fish), Black Skirt Tetra, Bumblebee Goby (Brackish). A centrepiece fish should be the focal point of your aquarium — choose one with colours and behaviour that complement your other species.
What schooling fish work in a 15 Gallon Standard?
Great schooling options include Black Neon Tetra, Cardinal Tetra, Chili Rasbora. Schooling fish should be kept in groups of at least 6 to encourage natural behaviour and reduce stress.
What bottom dwellers suit a 15 Gallon Standard?
Suitable bottom dwellers include Amano Shrimp, Assassin Snail, Bee Shrimp (Crystal Red / Black). These species occupy the lower zone of your tank, helping to keep the substrate tidy and adding activity to an often-overlooked area.
What temperature should a 15 Gallon Standard be?
The ideal temperature depends on the species you keep. Most tropical freshwater fish thrive between 24–27°C (75–80°F). Check each species' requirements and aim for the overlapping range that suits all your inhabitants.