Poecilia reticulata male multicolor

Decide whether this male guppy fits your aquarium

The multicolor male guppy (Poecilia reticulata) is a small livebearing fish in the family Poeciliidae. It is native to Venezuela, Barbados, Trinidad, northern Brazil and the Guianas, and the recorded maximum for a male or unsexed fish is 5 cm standard length. This peaceful, social fish suits a prepared beginner with a mature filtered aquarium, mineral-bearing water and enough room for a planned group.

FishBase records the guppy's identity, distribution and 5 cm maximum. Standard length measures the body without the tail fin, so the aquarium must accommodate the fish's body, flowing finnage and unobstructed swimming rather than treating 5 cm as its total tip-to-tip appearance.

The accepted scientific name remains Poecilia reticulata, as recorded by Eschmeyer's Catalog of Fishes. “Multicolor” describes the selected aquarium appearance; it does not create a separate species or change the care requirements of the guppy.

Wild guppies occupy varied habitats, including vegetated springs, ditches, canals, ponds and streams. FishBase records a wild diet of zooplankton, small insects and detritus. In an aquarium, those facts translate into a need for cover, open swimming room, suitable omnivore food and steady water quality rather than an attempt to recreate one narrowly defined wild habitat.

Our easy care rating means this fish can suit a keeper who has prepared the aquarium and can test and maintain it. It does not mean the fish belongs in an uncycled bowl or can tolerate accumulating ammonia, unstable temperature, unsuitable mineral content or persistent chasing.

Plan social space before adding a guppy

Plan for five or more guppies in a mature, filtered aquarium at least 60 cm long, provided the sex plan, other livestock, filtration and test results allow it. Keep the routine water at 22–28°C, pH 7.0–8.0 and 9–18 dGH, which sits inside the overlap of the FishBase, Seriously Fish and OATA ranges. These figures give the starting screen; usable swimming length, behaviour and biological capacity still decide whether the group fits.

FishBase gives a group of five or more and a 60 cm minimum aquarium length. Our complete Guppy Care Guide adopts that footprint and group size as its conservative house policy, alongside a mature filter, zero detectable ammonia and nitrite, open swimming room, cover and a separation option.

A litre figure alone cannot set a stocking maximum. Two aquariums with the same nominal volume may have different lengths, filter capacity, existing livestock and usable swimming space. Start with the adult group and footprint, then check how every fish feeds, swims and avoids pursuit before considering any addition.

Plan for growth from dispatch size to adult size

Plan around a 5 cm adult body length. The 3–4 cm dispatch grade describes the fish when sent, not its final size or age. FishBase records 5 cm standard length for male or unsexed fish, so allow extra room for the flowing domestic tail beyond that body length.

One purchase supplies one fish. Sex is guaranteed only when the exact product or selected option explicitly states male or female. This Poecilia reticulata male multicolor listing is sold as male.

That male designation helps with population planning, but it does not remove the need for a social group. A male-only group avoids new mating within that group, although displaying, chasing and competition can still occur. If females are housed in the wider aquarium, plan for courtship pressure and live young before combining the fish.

The gallery images are representative of this type of animal rather than photographs of the exact animal supplied, so colours can look slightly different from the live animal.

Selected guppy varieties can differ in colour placement and fin pattern while remaining the same species. Use the scientific identity, adult body size and care requirements for planning rather than expecting every individual to reproduce the representative pattern exactly. You can also browse the guppy collection to compare separately named forms without treating colour labels as different species.

Keep stable, mineral-bearing water

Keep this guppy at 22–28°C, pH 7.0–8.0 and 9–18 dGH. Maintain zero detectable ammonia and nitrite, and keep nitrate from exceeding 20 mg/L above the level in the tap water used for the aquarium.

The routine values form an overlap within FishBase's 18–28°C, pH 7.0–8.0 and 9–19 dGH range, Seriously Fish's 17–28°C, pH 7.0–8.5 and 8–30 dGH range, and OATA's guppy-and-molly group guidance of 20–28°C, pH 7.0–8.0 and 8–18 dGH. Tropical Fish Co uses 22–28°C as its routine display range.

Test the water the fish will actually live in

• Temperature: use an independent aquarium thermometer rather than relying only on the heater dial or room temperature.
• pH and hardness: test the aquarium and source water because UK tap-water chemistry differs between areas and can change.
• Ammonia and nitrite: both should remain at zero; any detectable reading of either calls for immediate investigation.
• Nitrate: keep it no more than 20 mg/L above the level in the tap water used for the aquarium.

Use our aquarium water chemistry guide to understand what each reading means, then use the water matcher to compare measured values with this range. Record the readings instead of describing the water only as hard, soft or neutral.

Change conditions gradually. Treat replacement tap water with a suitable conditioner before it enters the aquarium and avoid adding salt or minerals without a measured purpose and a compatibility check for every fish, invertebrate and plant. Guppies occur in fresh and brackish environments, but routine salt use does not follow automatically from that natural distribution.

Choose a mature, filtered aquarium with useful length

Use a mature, filtered aquarium at least 60 cm long for one small guppy group under our conservative house policy. Seriously Fish gives a 45 × 30 cm base and about 41 litres for the species, while FishBase gives a 60 cm minimum length. Use the 60 cm minimum when assessing swimming room, social behaviour and the aquarium footprint rather than judging the setup from litres alone.

A 41-litre label alone does not make an aquarium suitable; check that it is at least 60 cm long and meets every other care requirement. A short or unusually shaped aquarium should not be treated as suitable merely because its label exceeds that volume. Existing animals, a mixed-sex plan, future fry and weak filtration all reduce the room available to the guppy group.

Make the filter biologically ready

The RSPCA explains why a working biological filter is essential: fish release toxic ammonia, which bacteria convert to nitrite, which is also toxic, and then to nitrate, which is safer. Maturation means establishing that biological process and demonstrating it through water tests, not simply leaving an aquarium running for a set number of days.

• Confirm zero detectable ammonia and nitrite before adding the fish.
• Add livestock slowly so the bacterial population can adjust to additional waste and feeding.
• Keep the filter running and check that its flow reaches the aquarium without exhausting long-finned fish.
• Retest after additions, unusual feeding, filter work or any change in behaviour.

For a worked equipment example, Seriously Fish suggests four to five aquarium turnovers per hour for its approximately 41-litre setup, equivalent to a filter rated around 165–205 litres per hour. Actual performance changes with media, head height and blockage, so observe the aquarium rather than treating the box rating as delivered flow.

If this is a new system, follow our guide to preparing and maturing a first tropical aquarium before livestock arrives. A larger aquarium can make temperature and water quality more stable, but it still needs a functioning filter and regular testing.

Balance cover with open swimming room

Provide open horizontal swimming room, planted cover and places where one fish can move out of another's line of sight. Guppies appreciate planted aquariums and floating vegetation, but the layout should not become so dense that weaker fish miss food or persistent pursuit goes unseen.

Use aquarium gravel or sand with live plants where practical. Artificial plants and ornaments can also provide shelter, but choose smooth pieces without sharp edges that could catch or tear elongated fins. Check narrow gaps against the fish's adult body and fin spread rather than assuming a small ornament is safe for a small fish.

Set the flow by watching the fish

• Good flow: the fish can hold position, cross the aquarium and feed without being pushed away.
• Excess flow: the fish is pinned into calm corners, continually struggles against the current or cannot approach food normally.
• Poor circulation: debris accumulates while sections of the aquarium receive little movement; adjust the outlet without creating a harsh jet.

Seriously Fish advises avoiding strong currents, while OATA recommends gentler flow for long-finned fish. Direct the outlet so it provides circulation without forcing the guppy to swim hard continuously. Shield any intake that could endanger a small fish or fry.

Include a secure cover and retain clear access for observation and maintenance. Structure can interrupt chasing, but decor alone cannot correct an overcrowded group, unsuitable sex mix or incompatible tank mate. If one fish remains trapped behind plants, excluded from food or repeatedly driven to the surface, change the stocking or separate fish rather than adding more visual barriers indefinitely.

Dense floating cover can increase fry survival in a deliberately managed breeding aquarium. That outcome also increases demands on space, filtration, food and rehoming, so use dense nursery cover only as part of a population plan.

Feed a complete omnivore diet in measured portions

Use an appropriately sized, nutritionally complete omnivore flake or granule as the staple. Feed only what the group can consume within a few minutes once a day, check that every fish gets access, and remove uneaten food before it breaks down in the aquarium.

FishBase records zooplankton, small insects and detritus in the wild diet, while Seriously Fish describes wild guppies as primarily insectivorous and says tank-bred fish will accept most foods offered. A complete omnivore staple provides a practical base for aquarium fish while allowing compatible invertebrate and algal variety.

Add variety without replacing the staple

• Offer suitably small live or frozen foods such as daphnia, small bloodworm or tubifex as compatible variety.
• Match particle size to the fish's mouth so food can be taken promptly instead of sinking uneaten.
• Spread a measured portion where all members of the group can reach it.
• Store foods as directed and use aquarium foods rather than collecting organisms or detritus outdoors.

OATA's feeding guidance for guppies and mollies gives the once-daily schedule and the few-minutes portion rule. The right amount still depends on food size, the number of fish and whether every individual is eating. A shy fish that repeatedly misses meals needs a social or distribution adjustment, not simply a larger total portion.

If food remains after the group has stopped feeding, remove it and reduce the next portion. If one fish hangs back, watch for chasing, breathing changes, clamped fins, injury or difficulty swimming. Appetite loss is a warning sign to test water and inspect the fish rather than a reason to keep adding different foods.

Fry require food sized for much smaller mouths and especially close water-quality control. Plan a suitable nursery, mature filtration and repeated testing before deliberately raising young rather than improvising after the population increases.

Keep a weekly testing and maintenance routine

Test the aquarium at least once a week and change 25% of the water at least once every week. Treat replacement tap water with conditioner before adding it, match the new water gradually to the aquarium conditions and use a siphon to remove solid waste where it collects.

Check the whole system, not one reading

• Before the change: record temperature, pH, ammonia, nitrite and nitrate so trends remain visible.
• During the change: inspect plants, decor and the substrate for trapped food or waste.
• After the change: confirm normal filter flow and watch that the fish resume steady swimming and regular breathing.
• Between routines: investigate sudden behaviour or appetite changes immediately rather than waiting for the next scheduled test.

Ammonia and nitrite should remain at zero. Nitrate should not exceed 20 mg/L above the normal tap-water level. When a reading changes, check recent additions, feeding, decaying material, filter flow and maintenance before assuming the fish itself is the cause.

Check the filter for blockage during routine maintenance. If its media needs cleaning, rinse it lightly in water removed from the aquarium during a water change, never under the tap. Any chlorine or chloramine in tap water may kill the beneficial bacteria that process waste.

A filter should not be stripped clean simply because the media looks stained. Preserve biological function while removing enough accumulated debris to restore flow. Cleaning the media this way keeps more of the established bacteria working.

Keep a short written record of readings, water changes, additions and unusual signs. A sequence such as rising nitrate, reduced flow and leftover food gives a clearer action path than a single observation. Stable readings and normal feeding are also more useful than assuming that a fish described as easy will tolerate missed maintenance.

Manage the social group and sex plan deliberately

Keep five or more guppies where the aquarium, filtration and sex plan allow it. FishBase gives an aquarium group of five or more, and our house policy follows that number. OATA advises at least three for guppies and mollies, but the five-fish screen gives a more conservative starting group rather than a fixed entitlement to fill an aquarium.

This fish is sold as male. A male-only group prevents new mixed-sex mating within that group, but males can still display, chase and compete. Provide swimming room and sight breaks, watch whether every fish can feed, and keep a cycled separation option ready in case pursuit becomes persistent.

Read behaviour as a group outcome

If females are added later, plan for live young. OATA suggests two females for each male in mixed groups to reduce pressure, but no ratio guarantees calm behaviour or manageable reproduction. Adult fish will eat fry, and dense floating vegetation helps more fry survive; neither outcome is a population-control plan.

Decide in advance where fry would be housed, how suitable filtration and food would be provided, and how excess fish would be rehomed responsibly. A small uncycled container is not a safe nursery or separation system.

Do not release guppies, fry, plants, snails or aquarium water outdoors or into a pond, drain or natural waterway. Guppies have been introduced beyond their native range, and FishBase notes negative to neutral effects on native fishes rather than reliable mosquito control.

Follow the arrival procedure and act on health changes

Arrange for someone to be present to receive the fish, because live fish cannot be left unattended. It travels hand-bagged in pure oxygen inside an insulated poly box, with a heat pack when the weather calls for one, and is carried by a licensed live-animal courier.

Use the store arrival steps

1. Start filming before the parcel is opened, showing the parcel still sealed with the outer box visible.
2. Open it in one continuous take and show the fish still inside the bag before anything is disturbed.
3. Float the bag in the prepared aquarium for 20–30 minutes before releasing the fish.
4. Release the fish without pouring the bag water into the aquarium.

Read the delivery and Live Arrival Guarantee policy before the journey so the receiving person knows the packing, reporting and acclimatisation requirements.

Check swimming, breathing and condition

A settled guppy should swim steadily, breathe regularly, hold open undamaged fins, maintain a normal body profile and feed consistently. The RSPCA's fish health guidance treats changes such as surface gasping, unusual balance, clamped or damaged fins, spots, wounds, hiding and sudden appetite loss as warning signs that need investigation rather than a diagnosis from appearance alone.

If behaviour or condition changes, test ammonia, nitrite, nitrate, pH and temperature immediately. Inspect the filter, heater, recent maintenance, food, additions and social behaviour. Isolate the fish safely where appropriate, using a mature system that maintains the same suitable water range.

For planned quarantine, the MSD Veterinary Manual recommends at least 30 days, with longer isolation where indicated. Use dedicated equipment and biologically supported filtration so quarantine does not exchange water or tools with established aquariums.

Do not select salt, heat changes or medication from one symptom. If you are concerned about any warning sign, use the OATA fish-vet directory to find qualified help.

Screen every tank mate before combining fish

Treat this guppy as a peaceful community fish, but avoid fin-nipping species. Seriously Fish says not to keep guppies with fin-nipping species such as tiger barbs and serpae tetras.

Quiet-community livebearers, rasboras, corydoras, small loricariids and tetras may be considered when the exact species passes every check below. These are candidate kinds, not automatic companions.

Apply the full compatibility screen

Check the exact adult requirements of any proposed companion. “Tetra”, “livebearer” or “loricariid” covers animals with different sizes and behaviour, so the group name alone cannot decide compatibility. A quiet species can also become a poor fit when its required group leaves too little usable space.

Small shrimp or their young may be eaten, and “adult invertebrates” is too broad for a blanket promise. Screen the exact invertebrate for water chemistry, predation risk, feeding competition and sensitivity to any planned treatment.

Make the stocking and compatibility assessment before combining animals, then judge the result through feeding access, fin condition, swimming and use of cover. Compatibility remains an observed outcome rather than a permanent guarantee.

Intervene before pursuit causes damage or fry overwhelm the aquarium

Act when pursuit becomes persistent, one fish cannot escape, feeding access declines or fins are damaged. A peaceful species label describes the usual temperament; it does not make every group or aquarium combination safe.

Match the response to the sign

Do not add more guppies automatically to solve aggression. An addition increases waste and competition and can make the existing footprint unsuitable. Identify whether the problem is one individual, a fin-nipping companion, cramped space, blocked sight lines or competition at feeding time.

House guppies and Endler's livebearers in separate aquariums so each documented species line stays pure. The formal description of Poecilia wingei establishes Endler's livebearer as distinct from Poecilia reticulata, and Eschmeyer's Catalog lists Poecilia wingei as valid. The two can hybridise, so descendants should not be represented as pure examples of either species.

Keep a separation aquarium mature, filtered and within the same suitable water range. A divider or spare container without proven biological capacity may stop immediate contact but can introduce a water-quality problem, so test any emergency setup closely.

Get clear answers to common guppy questions

How big does Poecilia reticulata male multicolor get?

FishBase records a maximum of 5 cm standard length for male or unsexed Poecilia reticulata. Standard length excludes the tail fin, so domestic finnage can extend beyond the measured body length.

What size aquarium does Poecilia reticulata male multicolor need?

Use a mature, filtered aquarium at least 60 cm long under Tropical Fish Co's conservative guppy policy. Seriously Fish gives a 45 × 30 cm base at about 41 litres, but length, group size, sex plan, filtration, other livestock and water tests still decide whether the aquarium works.

How many Poecilia reticulata male multicolor should I keep together?

Keep five or more where aquarium capacity and the sex plan allow. FishBase gives an aquarium group of five or more, and Tropical Fish Co uses that number as its conservative group policy rather than a fixed stocking entitlement.

Is this male guppy suitable for beginners?

It suits a prepared beginner and carries Tropical Fish Co's easy care rating, but it needs a mature filtered aquarium, zero detectable ammonia and nitrite, stable mineral-bearing water, a planned social group and weekly maintenance.

What does Poecilia reticulata male multicolor eat?

Feed an appropriately sized complete omnivore flake or granule as the staple, with compatible variety such as daphnia, small bloodworm or tubifex. Feed only what the group can eat within a few minutes, once a day.

What temperature and pH does Poecilia reticulata male multicolor need?

Keep it at 22–28°C, pH 7.0–8.0 and 9–18 dGH, which sits inside the overlap of the FishBase, Seriously Fish and OATA ranges.

Is this male guppy aggressive or likely to nip fins?

Seriously Fish describes the guppy as very peaceful, but males may display and chase. Avoid fin-nipping species such as tiger barbs and serpae tetras, and intervene if any fish is cornered, excluded from food or damaged.

Which animals can this guppy live with?

Quiet-community livebearers, rasboras, corydoras, small loricariids and tetras may work when the exact species shares its water range and passes adult-size, behaviour, space and feeding checks. Small shrimp or young may be eaten.

How does it arrive alive in the UK?

It is hand-bagged in pure oxygen, placed in an insulated poly box with a heat pack when weather calls for it, and carried by a licensed live-animal courier; someone must be present to receive it.

Check the care and identity references

• FishBase: Poecilia reticulata — identity, distribution, environment, biology, recorded length and aquarium group note.
• Seriously Fish: Poecilia reticulata — aquarium dimensions, water ranges, diet, behaviour and compatibility.
• OATA: How to look after guppies and mollies — group water, feeding, maintenance and social guidance.
• RSPCA: Aquarium environment and filtration — biological filtration and waste processing.
• Eschmeyer's Catalog of Fishes: Poecilia reticulata — accepted scientific identity.
• RSPCA: Fish health and welfare — normal condition, warning signs and escalation.
• MSD Veterinary Manual: Management of aquarium fish — quarantine and water-quality-led investigation.
• OATA: Find a fish vet — UK fish-vet directory.
• Poeser, Kempkes and Isbrücker: description of Poecilia wingei — formal Endler's livebearer species description.
• Eschmeyer's Catalog of Fishes: Poecilia wingei — valid taxonomic status.