Lipeo livebearer
Jenynsia alternimaculata
Lipeo livebearers exhibit a slender body with distinct dark spots along the sides and a metallic sheen on their scales.
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About the Lipeo livebearer
A neat little Argentine-Bolivian livebearer from clear, cool hill streams, the Lipeo livebearer stays small and does great in a planted, nicely oxygenated setup. The quirky part is their one-sided mating thing, where males are left- or right-handed, which makes breeding pairs fun to watch. Keep a group and you will see lots of surface cruising and busy foraging.
Also known as
Quick Facts
Size
5.5 cm SL
Temperament
Semi-aggressive
Difficulty
Intermediate
Min Tank Size
20 gallons
Lifespan
2-4 years
Origin
South America
Diet
Omnivore - small flakes and micro pellets, plus frozen/live foods like daphnia and baby brine
Water Parameters
22-25°C
7-8
5-20 dGH
Need a heater for this species?
This species needs 22-25°C in a 20 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give them a 20-gallon long or bigger with a tight lid and decent flow; shoot for 64-72 F (18-22 C), pH 7.2-8.0, GH 8-20, and lots of surface agitation.
- Keep a group with more females than males (1M:2-3F) since males are pushy; add plants and hardscape to break lines of sight.
- Tankmates should be coolwater and quick: white clouds, zebra danios, and hillstream loaches work; skip bettas, guppies, angels, or any long-finned slow fish.
- Feed small portions twice daily: spirulina flake or small pellets plus frozen daphnia, baby brine, and the odd bloodworm; let some algae and biofilm stay for grazing.
- They are one-sided livebearers - males are left- or right-handed and only pair with females of the same side; buy a group to get matches, expect 4-6 week gestation, and give dense cover or pull parents or the fry will get picked off.
- Do 30-50% weekly water changes and keep the water cool and oxygen-rich; heat and stale water hit them hard, so keep under 75 F and use a fan or ice bottle during heat waves.
- They struggle in very soft, acidic water; if your tap is soft, bump minerals with crushed coral or a remineralizer, and quarantine newcomers since wild fish often bring worms (levamisole or flubendazole handles red stringy Camallanus).
Compatibility
Good Tankmates
- Fast cool-water schoolers like white clouds and zebra/pearl danios - quick enough to shrug off the occasional nip and happy in the 64-72 F range
- Rainbow shiners in a roomy, high-flow setup - same temp and tempo, and they spread the attention
- Peppered corys on sand - peaceful bottom crew that ignores the midwater squabbles
- Hillstream loaches (Sewellia/Gastromyzon) - love the same cool, oxygen-rich flow and stay out of the way
- Bristlenose plecos - armored and unfazed if a Jenynsia gets pushy, and they handle upper 60s to low 70s F fine
- Panda garra or similar Garra species - sturdy, active grazers that hold their own in current
Avoid
- Slow fish with fancy fins like guppies, long-fin variants, or angelfish - they get nipped to ribbons
- Tiny or timid nanos like celestial pearl danios, ember tetras, or endlers - they get harassed or become snacks
- Nippy roughnecks like tiger barbs or serpae/Buenos Aires tetras - just turns the tank into a slap fight
- Warm-water cichlids and gouramis (rams, apistos, bettas) - wrong temp and too much territorial drama
Where they come from
Lipeo livebearers are from cool, clear foothill streams in northwestern Argentina, including the Lipeo River. Think rocky runs with good current, bright light, and pockets of vegetation. They are built for oxygen-rich water and seasonal shifts, not warm, still ponds.
They are a cool-water livebearer. Aim for 64-74 F (18-23 C). Warmer than that and they get stressed fast.
Setting up their tank
Give them some room to cruise and some push from the filter. A 24-30 inch tank works well for a small group. They are surface and midwater fish, so length matters more than height.
- Tank size: 20-30 gallons for 6-8 fish
- Temperature: 64-74 F (18-23 C). They appreciate the lower half of that range
- pH: 7.0-8.0. Hardness: moderate, 6-18 dGH (TDS roughly 150-350 ppm)
- Flow: moderate. A hang-on-back with a spray bar or a small powerhead for extra current
- Substrate: sand or fine gravel with smooth river stones and cobbles
- Plants: vallisneria, hornwort, Java fern, or floating plants. Anchor plants so they do not uproot in current
- Cover: driftwood and rocks to break sight lines. They relax with places to duck into
- Lid: tight-fitting. They jump during chasing and feeding frenzies
- Lighting: normal community lighting. A bit of natural algae growth is a plus
If your tap water is very soft, tuck a small bag of crushed coral into the filter. These guys look and behave better with some minerals in the water.
Summer heat can wipe them out. Run a fan across the surface, boost aeration, and dim the lights if temps creep above 75 F.
What to feed them
They are true omnivores. Mine graze biofilm and algae all day, then go nuts for small live or frozen foods. Keep it mixed and keep the portions modest.
- Staples: quality spirulina flake, fine pellets, veggie wafers shaved down
- Green stuff: blanched spinach or zucchini slivers, algae wafers, nori crumbs
- Protein: live or frozen daphnia, baby brine shrimp, mosquito larvae, chopped bloodworms
- Occasional treats: crushed snails or cyclops
Two to three small feedings beat one big dump of food. They fill up fast and leftovers foul the water.
How they behave and who they get along with
Active, curious, and a bit scrappy. Males posture and chase, and they will nip fins if cramped or bored. Females are larger and more laid back. Keep them in a group so no single fish takes all the heat.
- Group makeup: 1 male to 3-4 females works well. If you keep multiple males, add extra space and cover
- Good tankmates: white cloud mountain minnows, zebra danios, peppered corydoras, hillstream loaches, smaller hoplos, hardy snails
- Use caution: long-finned fish (angels, bettas, fancy guppies) and small shrimp. Fins get nipped and shrimplets get eaten
Nipping usually means too-warm water, not enough flow, or not enough room. Fix the setup first before blaming the fish.
Breeding tips
They are livebearers with a twist. Males have a one-sided mating fin, and each male is either left- or right-oriented. Females tend to match one side better than the other. If you keep several males, the odds are good that at least one will be compatible.
- Stock a trio or harem: 1 male with 3-4 females, or 2-3 males with 6-8 females
- Condition with frequent small feeds of baby brine shrimp and spirulina
- Gestation: roughly 4-6 weeks, temperature-dependent
- Brood size: about 10-25 larger fry
- Fry safety: adults will pick at newborns. Dense plants, yarn mops, or a mesh breeder box help
- Fry food: powdered flake, newly hatched brine shrimp, microworms
Because of the left-right thing, keeping 3+ males usually gets you both orientations in the group and much better breeding success.
Common problems to watch for
- Heat stress: they get listless, gasp near the surface, and nip more at higher temps
- Low oxygen: heavy breathing and hanging in the filter outflow. Add air and current
- Water too soft or acidic: shimmying, thin appearance, poor appetite. Add mineral support
- Aggression from crowding: split the group, add cover, or upsize the tank
- Parasites on wild-caught fish: do a full quarantine and observe for wasting, stringy feces, or flashing
- New tank instability: they hate ammonia spikes. Mature the filter before adding them
Do not let a power outage or hot spell catch you off guard. A battery air pump and a clip-on fan have saved my group more than once.
Weekly 30-40% water changes keep them lively. Match temperature closely on refill to avoid shocking them.
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