Platy
Xiphophorus maculatus
Hardy, colourful community livebearerBeginner
- Lifespan
- 3-4 years
- Size
- 4-6cm / 1.5-2.5in
- Social needs
- Social; keep in small groups
- Time
- 10-15 min daily; weekly water change
- Cost
- Low
- Diet
- Omnivore (flake, pellet, veg, live foods)
Overview
What is this animal?
- Platies are stout, good-natured livebearers from Central America, bred into many colours and patterns such as sunset, wagtail, and mickey-mouse.
- Their hardiness and easy temperament make them a staple of beginner community tanks.
- Like their relatives the swordtail and molly, they breed readily and give birth to live fry.
- They are forgiving of minor mistakes but still need a properly cycled, heated tank to reach their full lifespan in good health.
Temperament
- Platies are peaceful, sociable, and active, suiting most calm community tankmates.
- They shoal loosely rather than tightly and are confident enough to occupy the middle and upper water without hiding.
- Males can pester females, so a female-biased ratio reduces stress.
- They are ready breeders, and a mixed group will steadily produce fry, which adults will eat unless dense planting offers the young somewhere to hide.
A good fit for
- Beginner community aquariums
- Keepers wanting hardy, colourful fish
- Children's first properly set-up tanks
- Planted tanks needing gentle algae grazers
Common mistakes to avoid
- Keeping in soft, acidic water
- Overfeeding leading to obesity and constipation
- Unplanned breeding from mixed-sex groups
- Skipping cycling and assuming hardiness covers it
Enclosure
Minimum 57 litres (15 US gallons) — for a group of 3
Cannot be kept alone. The minimum is 3, and the space above is for that group.
- Provide a cycled, heated, filtered tank of at least 57 litres (15 gallons) for a small group, kept at 20-26C (68-79F).
- Platies favour slightly hard, alkaline water and an open swimming area framed by planting for cover and fry refuge.
- They are adaptable but dislike soft, acidic water and unstable parameters.
- Maintain low nitrate with weekly partial water changes.
- A secure lid is wise, and their active nature means they appreciate length of tank over height.
Supplies
Setup
- Tank and stand
- Filter
- Heater and thermometer
- Substrate, plants and decor
- Liquid test kit
- Dechlorinator and starter supplies
Ongoing
- Quality tropical flake or micro-pellet
- Spirulina or vegetable flake
- Frozen brine shrimp and daphnia
- Frozen or freeze-dried bloodworm
- Veg clip for courgette and spinach
- Baby brine shrimp hatchery or frozen equivalent for fry
- Fine net for removing leftovers
Safe substrate: Inert aquarium gravel · Fine, smooth sand · Aquasoil for planted tanks
Care routine
Daily
- Check temperature and equipment
- Feed
- Head-count and look everyone over
Weekly
- Top up evaporationevery 3 days
- Clean glass and clear algae
- Test the water
- Water change and gravel vacuum
Monthly
- Trim and thin the plantsevery 2 weeks
- Check supplies and reagent dates
- Review the fry plan
- Rinse the filter media
Less often
- Replace chemical filter media (Carbon/Purigen)every 2 months
Vet: Quarterly stocking and health review — every 3 months
Top resources for more info
Independent creators and organisations we would send a friend to. We have no affiliation with any of them, and nothing here is sponsored. Links checked 2026-09-19.
YouTubers
Sites
Go deeper
Diet
- Platies are omnivores with a notable appetite for vegetable matter.
- Feed a quality flake or pellet as the base, and regularly include spirulina, blanched greens, and algae alongside frozen or live treats like daphnia and bloodworms for balance.
- Offer small amounts once or twice daily, clearing within a couple of minutes.
- They readily overeat, and obesity and constipation are common in well-fed platies, so include fibre-rich greens and avoid heavy continuous feeding.
Health
- Hardy by nature, platies stay healthy with clean, stable water but are prone to the usual livebearer issues when neglected: ich, fin rot, and constipation from poor diet.
- Stable warmth and good filtration prevent most problems.
- Mass-produced stock can carry weaker genetics, so source carefully and quarantine new fish.
- Watch for a swollen belly, stringy faeces, or loss of appetite, often signs of dietary or parasite trouble that respond to corrected feeding and parameters.
Is your enclosure big enough?
Is this urgent?
In a fish tank the patient is usually the water. Test before you treat — dosing a healthy tank for a disease it does not have makes things worse.
Go now
Today
Soon
Never add a new fish to a tank that is not fully cycled, and never treat blind. A test kit is cheaper than the fish.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it — and the time to find one is before you need one.
What it really costs
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
Bedding and substrate
Substrate in an aquarium is a filter as much as a floor. Most of the biology lives in and on it.
Safe
With a caveat
Never
This is our general list for freshwater fish. We have not built one specific to Livebearers yet.
My kit says 0.25 ppm. Is that dangerous?
A liquid kit measures total ammonia, but only the un-ionised fraction is really toxic, and that fraction is governed by pH and temperature — each whole pH unit multiplies it roughly tenfold. So the same reading can be nearly harmless in one tank and lethal in another; this works out which one you are in.
Compare with other animals
The same axes for every animal, side by side — the way the guides are written makes that a fair comparison rather than two articles.
Livebearers, side by side
Same axes, same care guides — the honest way to choose between types.
See all Livebearers side by side →
