Red Tail Barracuda
Acestrorhynchus falcatus
A fast-moving, torpedo-shaped predator native to the Amazon and Orinoco basins. Despite the name, it is a characin, not a true marine barracuda. It is strictly piscivorous (eats other fish) and requires a large, long aquarium with high flow and a tight-fitting lid due to its tendency to jump when startled. Highly predatory but can be skittish if kept with aggressive or overly boisterous tankmates.
Red Tail Barracuda At a Glance
Red Tail Barracuda Tank Requirements
Will Red Tail Barracuda fit in your tank?
Care guides tell you what Red Tail Barracuda needs, the next question is whether your tank can safely provide it. Test Red Tail Barracuda against your tank size, maintenance needs, and the fish you already keep before you buy.
Red Tail Barracuda Water Parameters
Red Tail Barracuda Temperament & Compatibility
Red Tail Barracuda Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard Adult
Fully grown adult specimen. Requires a massive footprint for high-speed swimming and tankmates that are too deep-bodied or large to be swallowed whole.
Same care requirements as the base species
Also known as: Adult, Full Grown
Juvenile (Grow-out)
Young specimen typically sold around 10cm. Extremely fast growth rate when fed a proper protein-rich diet. Will quickly outgrow standard aquariums. Very skittish; sudden movements outside the tank may cause them to dash into the glass.
Differs in 4 traits from base species
Also known as: Baby, Juvenile, Pup
Red Tail Barracuda Care Guide Summary
The Red Tail Barracuda, scientifically known as Acestrorhynchus falcatus, belongs to the Characins family group. Adults reach a maximum size of approximately 27 cm and have a fusiform body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the surface and mid-level zones of the aquarium and produces a high level of biological waste.
To thrive, the Red Tail Barracuda requires a freshwater only aquarium with a minimum volume of 450 litres and a tank length of at least 150 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 6–7.5 and a general hardness of 2–15 dGH. A high water flow is preferred.
Due to its specialist needs, the Red Tail Barracuda is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard Adult and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Red Tail Barracuda Habitat Setup
When setting up an aquarium for the Red Tail Barracuda, a high water flow best suits their natural preferences. Because this species occupies the surface and mid-level zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels, driftwood, which can serve as both a hiding place and a dietary supplement, and floating plants to diffuse overhead light and create shaded areas. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Red Tail Barracuda Compatibility Notes
Classified as aggressive, the Red Tail Barracuda is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and ornamental shrimp are not safe companions. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Who Red Tail Barracuda Is Actually For
Red Tail Barracuda is best for a fishkeeper who expects a species with attitude and plans the tank around that behavior and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially smooth gravel.
The most common mistake is buying Red Tail Barracuda for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.
Red Tail Barracuda Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Red Tail Barracuda.
Red Tail Barracuda Feeding & Diet Considerations
The Red Tail Barracuda is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided and will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups.
Frequently Asked Questions About Red Tail Barracuda
How big does Red Tail Barracuda get?
Red Tail Barracuda (Acestrorhynchus falcatus) typically reaches a maximum adult size of approximately 27 cm. They have a fusiform body shape and a fast growth rate.
What tank size does Red Tail Barracuda need?
A minimum aquarium volume of 450 litres and a tank length of at least 150 cm are recommended for Red Tail Barracuda. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Red Tail Barracuda need?
Red Tail Barracuda thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 6 and 7.5, and a general hardness of 2–15 dGH. A high water flow is preferred.
Is Red Tail Barracuda peaceful or aggressive?
Red Tail Barracuda is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Red Tail Barracuda live alone?
Yes, Red Tail Barracuda can be kept singly or in a group. They are flexible and adapt well to both setups.
Is Red Tail Barracuda safe with shrimp?
No. Red Tail Barracuda is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Red Tail Barracuda have any special tank requirements?
Yes. Red Tail Barracuda benefits from smooth gravel (sensitive barbels), driftwood (digestion/hiding), and plants - floating in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Red Tail Barracuda need a lid on the tank?
Yes. Red Tail Barracuda is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Red Tail Barracuda
These plants pair well with Red Tail Barracuda based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Water Fern
Bolbitis heudelotii
Boivin's Aponogeton
Aponogeton boivinianus
Capuron's Aponogeton
Aponogeton capuronii
Madagascar Lace Plant
Aponogeton madagascariensis
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Fish Similar to Red Tail Barracuda
Freshwater Barracuda
Ctenolucius hujeta
The Freshwater Barracuda, or Hujeta Pike Characin, is an elongated, torpedo-shaped ambush predator. It primarily inhabits the upper water levels. Though peaceful with fish too large to swallow, it is a highly efficient piscivore and will readily consume smaller tank mates like Tetras or Guppies. Known to be skittish and prone to fatal jumping, a tight-fitting lid is strictly required.
Red-Tail Catfish
Phractocephalus hemioliopterus
A massive, fast-growing predatory catfish from the Amazon basin. Famous for its voracious appetite, bulldozer-like behavior, and distinct red caudal fin. Due to its enormous adult size (often exceeding 4 feet), it is strictly a 'monster fish' that requires a heated indoor pond or a colossal custom aquarium. It is highly predatory and will swallow absolutely any tank mate that can fit into its cavernous mouth.
Pink Tailed Chalceus
Chalceus macrolepidotus
A large, incredibly active, and fast-swimming characin from South America known for its shimmering silver body and striking pink tail. They are primarily surface dwellers and are notorious jumpers, so a tight-fitting lid is absolutely mandatory. While generally peaceful with larger tankmates, they are predatory and will consume small fish. They must be kept either singly or in a shoal of 6+; small groups often result in severe squabbling.
Banded Leporinus
Leporinus fasciatus
A large, striking, cigar-shaped characin native to the Amazon Basin, recognized by its bold black and yellow bands. While beautiful, they are notoriously active, prone to jumping, and infamous for systematically destroying live plants. They grow quite large and can be semi-aggressive, particularly toward their own kind or fish with long fins.
Sturgeon Catfish
Platystomatichthys sturio
A striking, ancient-looking predatory catfish native to the fast-flowing rivers of the Amazon basin. Known for its highly elongated, delicate snout and long maxillary barbels, it resembles a sturgeon. They are very active swimmers that require massive aquariums with massive footprints to prevent permanently damaging their snouts against the glass. They are highly predatory toward small fish but peaceful with large, deep-bodied tank mates.
False Rummy-Nose Tetra
Petitella georgiae
A small, peaceful, and highly active schooling fish known for its bright red snout and black-and-white striped tail. Often confused with the True Rummy-Nose (Hemigrammus rhodostomus) or Firehead Tetra (Hemigrammus bleheri), the 'False' Rummy-Nose is distinguished by red coloration that typically does not extend past the gills. They are excellent indicator fish; their red noses will pale if water quality drops. They require ample horizontal swimming space and pristine water conditions.