A highly active, schooling cyprinid native to the clear, flowing streams of Southeast Asia. Known for their iridescent, pearlescent bodies that shimmer under aquarium lighting with hints of blue, pink, and orange. They are very hardy but require significant horizontal swimming space and a tight-fitting lid due to their notorious jumping ability.
Pearl Danio At a Glance
Pearl Danio Tank Requirements
Will Pearl Danio fit in your tank?
Care guides tell you what Pearl Danio needs, the next question is whether your tank can safely provide it. Test Pearl Danio against your tank size, maintenance needs, and the fish you already keep before you buy.
Pearl Danio Water Parameters
Pearl Danio Temperament & Compatibility
Pearl Danio Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard Pearl Danio. Best kept in groups of 6 or more to reduce stress and display natural schooling behavior. Because of their hyperactive nature, they can inadvertently outcompete slow, shy fish during feeding time.
Same care requirements as the base species
Also known as: Wild Type
Pearl Danio Care Guide Summary
The Pearl Danio, scientifically known as Danio albolineatus, belongs to the Cyprinids family group. Adults reach a maximum size of approximately 6.5 cm and have a fusiform body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the surface and mid-level zones of the aquarium and produces a low level of biological waste.
To thrive, the Pearl Danio requires a freshwater only aquarium with a minimum volume of 75 litres and a tank length of at least 80 cm. Water temperature should be maintained between 20°C and 26°C, with a pH range of 6–8 and a general hardness of 2–15 dGH. A moderate water flow is preferred.
The Pearl Danio is a rewarding species to keep, provided its core environmental needs are met. The Pearl Danio is typically available in one standard form.
Pearl Danio Habitat Setup
When setting up an aquarium for the Pearl Danio, a moderate 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 dense planting to provide cover, break sightlines, and reduce stress. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Pearl Danio Compatibility Notes
Classified as peaceful, the Pearl Danio 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, shy or slow-feeding tankmates may be outcompeted at feeding time and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Who Pearl Danio Is Actually For
Pearl Danio 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 Pearl Danio 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.
Pearl Danio Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Pearl Danio.
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
Show 12 more tank sizes
Frequently Asked Questions About Pearl Danio
How big does Pearl Danio get?
Pearl Danio (Danio albolineatus) typically reaches a maximum adult size of approximately 6.5 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Pearl Danio need?
A minimum aquarium volume of 75 litres and a tank length of at least 80 cm are recommended for Pearl Danio. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Pearl Danio need?
Pearl Danio thrives in freshwater only conditions with a temperature range of 20–26°C, a pH between 6 and 8, and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Is Pearl Danio peaceful or aggressive?
Pearl Danio is classified as peaceful with an aggression score of 1 out of 10. They are generally well-suited to peaceful community tanks.
How many Pearl Danio should be kept together?
Pearl Danio 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 Pearl Danio have any special tank requirements?
Yes. Pearl Danio benefits from plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Pearl Danio need a lid on the tank?
Yes. Pearl Danio 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.
Useful setup supplies
We may earn from qualifying purchases
Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 7, 2026
- Last updated
- May 7, 2026
- Issues or corrections?
- Contact the editorial team
Top Tank Mates for Pearl Danio
These fish are strong compatibility matches for Pearl Danio based on water preferences, temperament, adult size, and tank behavior.
Spotted Hillstream Loach
Gastromyzon punctulatus
Ideal Tank MatesTrapdoor Snail
Cipangopaludina chinensis
Ideal Tank MatesShovelnose Sturgeon
Scaphirhynchus platorynchus
Ideal Tank MatesSkunk Cory
Corydoras arcuatus
Ideal Tank MatesSan Juan Cory
Corydoras bilineatus
Ideal Tank MatesPetricola Catfish
Synodontis petricola
Ideal Tank MatesPlants That Suit Pearl Danio
These plants pair well with Pearl Danio 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 Pearl Danio
Rose Danio
Danio roseus
A lively and colorful schooling fish from Southeast Asia. Rose Danios are characterized by their pinkish-purple iridescence, which becomes especially vibrant in well-planted tanks with subdued lighting. Like all Danios, they are incredibly active swimmers and prolific jumpers, requiring a tight-fitting lid and a horizontally long tank to accommodate their energetic nature.
Zebra Danio
Danio rerio
One of the most robust and active aquarium fish available. Native to South Asia, they are a model organism in science due to their genetics. They are extremely active top-level swimmers that must be kept in schools to prevent stress and fin-nipping. They prefer cooler, oxygen-rich water with a current.
Giant Danio
Devario aequipinnatus
The Giant Danio is a robust, incredibly active schooling fish native to fast-flowing streams in South Asia. Known for their striking blue and gold horizontal stripes, they are constantly in motion and require long tanks with strong water flow. Due to their boisterous nature, they make excellent 'dither fish' for mild-mannered cichlids but should not be kept with slow, shy, or long-finned species as they will easily outcompete them for food.
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.
Emerald Dwarf Danio
Danio erythromicron
An exquisite, tiny cyprinid endemic to Lake Inle in Myanmar. Known for their striking emerald vertical bands and reddish-orange fins. Because they originate from a slightly alkaline mountain lake, they prefer cooler, harder water than many tropical fish. They are notoriously shy and must be kept in schools in heavily planted tanks with broken sightlines to feel secure.
Glowlight Danio
Danio choprae
A strikingly colorful and hyperactive nano fish native to the Irrawaddy River drainage in Myanmar. Named for its glowing orange/red horizontal bands and vertical barring. Despite their small size, they are incredibly fast, dynamic swimmers that require a long aquarium with ample swimming space. They must be kept in large schools and are notorious jumpers, so a tight-fitting lid is mandatory.