A striking, deep-red schooling fish known for its highly active nature. While hardy and beautiful, Serpae Tetras are notorious fin-nippers. This behavior is usually localized within their own pecking order if kept in large enough schools (8+), but they should never be housed with slow-moving or long-finned tank mates like Bettas, Angelfish, or Gouramis.
Serpae Tetra At a Glance
Serpae Tetra Tank Requirements
Will Serpae Tetra fit in your tank?
Care guides tell you what Serpae Tetra needs, the next question is whether your tank can safely provide it. Test Serpae Tetra against your tank size, maintenance needs, and the fish you already keep before you buy.
Serpae Tetra Water Parameters
Serpae Tetra Temperament & Compatibility
Serpae Tetra Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
Same care requirements as the base species
Also known as: Short Finned, Wild Type
Long Finned
Differs in 2 traits from base species
Also known as: Longfin Serpae, Veiltail Serpae
Serpae Tetra Care Guide Summary
The Serpae Tetra, scientifically known as Hyphessobrycon eques, belongs to the Characins family group. Adults reach a maximum size of approximately 4.5 cm and have a compressed body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a low level of biological waste.
To thrive, the Serpae Tetra requires a freshwater only aquarium with a minimum volume of 75 litres and a tank length of at least 60 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 5–7.5 and a general hardness of 2–15 dGH. A moderate water flow is preferred.
The Serpae Tetra is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Standard and Long Finned. 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.
Serpae Tetra Habitat Setup
When setting up an aquarium for the Serpae Tetra, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include dense planting to provide cover, break sightlines, and reduce stress.
Serpae Tetra Compatibility Notes
Classified as semi-aggressive, the Serpae Tetra is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, avoid housing with slow-moving or long-finned species that may become targets for fin nipping, conspecific aggression can be intense, especially in smaller tanks, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Who Serpae Tetra Is Actually For
Serpae Tetra is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide a keeper who can commit to a proper group of at least 6. It makes the most sense for a hobbyist who will actually build around its needs, especially plants.
The most common mistake is buying Serpae Tetra for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is underestimating its social needs. A token pair or trio often behaves very differently from a real group.
Serpae Tetra Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Serpae Tetra.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 17 more tank sizes
Frequently Asked Questions About Serpae Tetra
How big does Serpae Tetra get?
Serpae Tetra (Hyphessobrycon eques) typically reaches a maximum adult size of approximately 4.5 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Serpae Tetra need?
A minimum aquarium volume of 75 litres and a tank length of at least 60 cm are recommended for Serpae Tetra. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Serpae Tetra need?
Serpae Tetra thrives in freshwater only conditions with a temperature range of 22–28°C, a pH between 5 and 7.5, and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Is Serpae Tetra peaceful or aggressive?
Serpae Tetra is classified as semi-aggressive with an aggression score of 5 out of 10. They can work in community setups but may clash with certain tankmates.
How many Serpae Tetra should be kept together?
Serpae Tetra is a schooling species and should be kept in groups of at least 6. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Serpae Tetra have any special tank requirements?
Yes. Serpae Tetra benefits from plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- April 28, 2026
- Last updated
- April 28, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Serpae Tetra
These plants pair well with Serpae Tetra based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Baby Tears
Lindernia rotundifolia
Balansae
Cryptocoryne crispatula
Fish Similar to Serpae Tetra
Red Eye Tetra
Moenkhausia sanctaefilomenae
The Red Eye Tetra is a hardy, active schooling fish recognizable by the bright red upper half of its eye and a striking black and yellow band at the base of its tail. As a robust and highly adaptable species, it is excellent for beginners. However, they are highly active and can become 'fin nippers' if kept in groups smaller than 6 or in confined spaces.
Rosy Finned Tetra
Hyphessobrycon rosaceus
A beautiful, deep-bodied tetra known for its reddish-pink hue and striking dorsal fin, which features a prominent black patch and white tip. They are peaceful, active schooling fish that thrive in heavily planted tanks with slightly acidic, soft water. Males frequently engage in harmless mock-battles by flaring their fins to establish hierarchy.
Bloodfin Tetra
Aphyocharax anisitsi
An extremely hardy and energetic schooling fish characterized by its silver body and striking bright red fins. As exceptionally active swimmers, they require plenty of horizontal swimming space. They are very adaptable to temperature and water parameters, making them a fantastic choice for beginners. Must be kept in groups to curb minor fin-nipping tendencies.
Buenos Aires Tetra
Hyphessobrycon anisitsi
A large, incredibly hardy, and highly active tetra from South America. While they are nearly bulletproof regarding water parameters and great for beginners, they are notorious fin-nippers and voracious plant eaters. They must be kept in larger schools to disperse internal aggression and housed with equally robust, fast-moving tank mates (like larger Barbs or robust Catfish). Do not keep with long-finned fish, slow swimmers, or in delicate aquascapes.
Lemon Tetra
Hyphessobrycon pulchripinnis
A peaceful, deep-bodied schooling tetra known for its translucent yellow coloration and striking black and yellow fins. They are robust and active, making them an excellent choice for planted community aquariums. Their colors intensify significantly in a well-established tank with a dark substrate and proper schooling numbers.
Colombian Tetra
Hyphessobrycon columbianus
A larger, deep-bodied tetra known for its striking metallic blue body and bright red fins. They are very active and can be somewhat boisterous. They are known to occasionally nip fins if kept in groups that are too small or in tanks that lack adequate swimming space.