Tankably

Tankably is your comprehensive resource for learning, building, and maintaining beautiful aquatic environments.

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Hemigrammus erythrozonus, the glowlight tetra, comes from Guyana and is known for its bright copper-orange stripe. It is a peaceful shoaling fish that looks best in soft, acidic, shaded blackwater-style aquariums with leaf litter and plants.

https://t.co/QivmJldWxt

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Prionobrama filigera, the glass bloodfin tetra, is a peaceful Amazon Basin characin with a nearly transparent body and red-tinted fins. Males develop a threadlike anal-fin extension, and the species often spawns early in the morning over plants.

https://t.co/rct7mxP6hs

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Peaceful black neon tetra from Paraguay basin, Hyphessobrycon herbertaxelrodi is a hardy shoaling fish with vivid white-over-black stripes and a red-yellow eye band. It thrives in planted, lit aquariums and eats tiny invertebrates plus plants.

https://t.co/7zLlmHlVhR

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Nannostomus marginatus exhibits strong sexual dimorphism where males are more brilliantly colored with red anal fin markings, while females remain duller. They prefer acidic water, and must be kept in schools of at least five to six individuals.

https://t.co/k5a2PgyBop

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Hypseleotris compressa tolerates fresh to full seawater. Males turn vivid red with black/white fin bands to attract females, who deposit around 3,000 adhesive eggs. Dads guard the clutch for 10-14 hrs until 1mm larvae hatch & drift downstream.

https://t.co/j0f0PY7ThV

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Pterophyllum altum is silver with red-brown stripes. It shows blue-green sheen & black gill spot when aroused. Carnivorous, territorial in groups; needs acidic soft water, dim plants, wood. Challenging for advanced aquarists; available July-Oct.

https://t.co/ipvReSRhUu

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Hyphessobrycon peugeoti is named after the Peugeot family, who invented the pepper mill mechanism in 1842. Its discovery in Brazil was connected to a reforestation project on their fazenda São Nicolau, where this rare tetra was first found.

https://t.co/TN4bP2mwc0

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BBoraras maculatus thrives in blackwater peat swamps of Malaysia, Sumatra, and Thailand, where tannins stain water brown & acidic. Its orange-red body dazzles w/ dark blue spots; peaceful schoolers love dim light, dense plants like Java moss.

https://t.co/gCAKXSAtvR

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Ancistrus cirrhosus boasts bony plates and breathes via modified stomach in low oxygen waters. Cave-breeder: Males guard 20-200 adhesive eggs fanning them while fasting; fry stay protected 7-10 more days. Vegetarian diet peaceful community fish.

https://t.co/vJ19BrpVA9

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Austrolebias affinis is a vulnerable annual killifish. Its eggs enter diapause in peat substrate to endure dry seasons, hatching with rains. Males court by flaring fins vibrantly before diving to spawn; carnivorous, territorial, 1-year lifespan.

https://t.co/4EX2mRSafe

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Copella arnoldi, the splash tetra, is an omnivore who eats insects, worms, and crustaceans near the surface. In aquariums, keep in groups with plants and a lid, because it's a jumper! It's pinkish, peaceful and peaks breeding in rainy seasons.

https://t.co/Kbz3YctTnL

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Gasteropelecus sternicla known as the common hatchetfish schools under floating plants at the surface. Its hatchet underbelly and oversized pectoral muscles fuel leaps from water, hydroplaning 3 to 4m to dodge predators or nab aerial insects.

https://t.co/984RuTzpTA

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Leptobarbus hoevenii or "mad barb" roams SE Asian rivers like those in Borneo & Malay Peninsula, migrating to flooded forests for spawning. It eats Chaulmoogra seeds, gets intoxicated, swims wildly, hence the name! It has an omnivorous diet.

https://t.co/1iCqFlfLaZ

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Osteogaster melanotaenia, once called Corydoras melanotaenia, is an armored freshwater catfish from Colombia’s Meta River basin. It is known to live in slightly acidic streams, and uses intestinal air‑breathing to survive in low‑oxygen water.

https://t.co/3efN5YzInN

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Hoplisoma melanistium is a peaceful, shoaling catfish from South America that thrives in groups and with soft sand or rounded gravel. It enjoys sinking tablets and frozen foods, and shows distinct black spots contrasting with lighter body tones.

https://t.co/8i0mPJOAY9

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Epiplatys spilargyreius browses algae and small insects, and is not a seasonal killifish. In the wild it occurs in loose groups with one dominant male, near the surface in slow‑moving habitats from Senegal to the Nile and across the Congo basin.

https://t.co/qoUkFpVWA0

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Brachyrhaphis roseni is from the Poeciliidae family which often schools with other small fishes. It shows distinct male–female behavior differences, with males employing unique mating maneuvers and bold, active tendencies in risky habitats.

https://t.co/mswFNxcPIN

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Nannostomus eques is a South American pencilfish known for swimming at an oblique angle, head‑up and tail‑down, a posture it shares with N. unifasciatus. It inhabits slow‑moving blackwater streams and flooded forests, often in dense vegetation.

https://t.co/Ok8dv0KnYC

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Known as the Siamese algae-eater, Crossocheilus oblongus is a peaceful, bottom-dwelling cyprinid from fast-flowing rivers in Thailand and Malaysia, famed among aquarists for grazing stubborn algae and best kept in active shoals of five or more.

https://t.co/B2dbR9VeYC

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Nannostomus beckfordi, the golden pencilfish, hails from slow Amazonian backwaters. Males guard tiny group territories, spawn among fine plants, then often snack on their own eggs, while their stripes shift to a barred night camouflage pattern.

https://t.co/AY6LpGyFxq