Variatus platy

Quick facts

Adult size

7 cm

Lifespan

can live up to 4 years

Tank zone

mid

Temperament

peaceful

Difficulty

beginner

Water parameters

Temperature

18–26°C

pH

7.0 to 8.5

Hardness

8 to 25 dGH

Tank requirements

Minimum volume

75 L

Minimum length

60 cm

Flow

low

Lighting

dim preferred

Substrate

any

Open swimming room

needed

Feeding

Diet: omnivore, feeds primarily at the mid.

Eats anything. Flake, pellets, frozen food, blanched vegetables, algae. Include vegetable matter in the diet; variatus platies graze on algae more actively than southern platies. Feed twice daily in moderate amounts. Color-enhancing foods improve the vibrancy of the many color varieties available. Not competitive or aggressive at feeding time.

Vegetable matter required (algae wafers, blanched zucchini, spinach).

Compatibility

• Same family and essentially the same care as the southern platy (X. maculatus). Variatus platies are slightly hardier and tolerate cooler temperatures (15–25°C), making them suitable for unheated tanks.
• Peaceful, active community fish. Works with everything from tetras and barbs to corydoras and loaches. Males chase females but with less intensity than swordtails.
• Cross-breeds with other Xiphophorus species. Many fish sold as 'platy' in stores are actually variatus-maculatus hybrids. Pure variatus stock is available from specialist breeders.
• Excellent choice for outdoor summer ponds and subtropical setups. The cold tolerance sets them apart from southern platies.

Habitat

Native to rivers and streams in northeastern Mexico, from Tamaulipas through San Luis Potosi and Veracruz. Found in clear, flowing water at elevations where temperatures drop significantly during winter months, which is why the species tolerates cooler water (15–25°C) better than most livebearers. Wild variatus platies are olive with variable spotting and fin coloration. The selectively bred color varieties are numerous: sunset, rainbow, blue, gold, red, marigold, and many more. Hybridization with X. maculatus and X. hellerii has produced additional varieties that blur the species lines commercially. Adult size is 5–7 cm. The species (Xiphophorus variatus) was described by Meek in 1904. It's less widely sold than the southern platy but has dedicated followers among livebearer enthusiasts, particularly those who keep subtropical or unheated setups. Commercially bred, though in smaller quantities than X. maculatus.

Breeding

Livebearer that breeds continuously. Females produce 20-50 fry every 4-6 weeks. Fry are born fully formed and free-swimming. They eat crushed flake and baby brine shrimp from day one. Females store sperm for multiple broods. In community tanks, most fry are eaten; dense floating plants improve survival. The species breeds at cooler temperatures than most livebearers, with spawning occurring even at 18–20°C. This cool-water breeding ability makes them useful in unheated setups and outdoor ponds during the warmer months. Population management is the same as other livebearers: separate sexes or maintain natural predation to prevent overstocking.

Common problems

Few problems. Variatus platies are among the hardiest freshwater fish available. They tolerate temperature swings, moderate water chemistry variation, and a wide range of diets without complaint. Internal parasites (Camallanus worms) appear in some farm-raised stock; treat with levamisole. Hybridization with other Xiphophorus species in mixed tanks produces offspring of uncertain genetics. If maintaining variatus purity matters (for show or breeding purposes), keep them separate from other platies and swordtails. Color fading over generations in captivity occurs without selective breeding pressure; wild-type coloring reasserts itself.

Bioload

Bioload coefficient: 1.5 (slightly larger than common platy; similar per-cm load).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size