Endler Guppy Care Guide
Endler Guppy Care Guide
Tank Setup, Feeding, Water Parameters & More
Tank Setup, Feeding, Water Parameters & More
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Complete Care Guide
Complete Care Guide
Comprehensive care guide for Pure Strain Endler Guppies — covering tank setup, water quality, behavior, diet, breeding, compatible tank mates, and maintenance tips to help your Endlers thrive. With proper care, Endlers display show-stopping color, natural behaviors and breed readily. Review the concise “At A Glance” care guide, then explore the detailed guidance provided in the sections below.
Browse our registered Pure Strain N Class Endlers to see available strains.
Endler Care Guide - At A Glance
Endler Care Guide - At A Glance
Tank Set-Up & Water Quality
Tank Set-Up & Water Quality
Endler guppies are exceptionally hardy and easy to maintain, thriving in most standard freshwater tropical aquarium setups. They adapt well to a wide range of conditions and are especially well suited to planted aquariums, which closely resemble their natural habitat and provide added comfort and security.
While Endlers tend to prefer warmer, moderately hard water, these conditions are not strict requirements. It’s important to note that higher water temperatures promote faster growth, but may also slightly shorten lifespan.
Thanks to their small adult size, Endlers are an excellent choice for nano and desktop aquariums, though they will always benefit from additional space when available. They are also remarkably peaceful, making them ideal community fish that coexist well with other calm species. See the Recommendations section below for common compatible tank mates and other suitable aquarium inhabitants.
Recommended Water Parameters
Temperature: 64°–82°F (ideal 78°–80°F)
pH Range: 6.5–8.5 (ideal 7.0–8.0)
General Hardness (GH):10-20 dGH
Nitrates: 20 ppm or below
Nitrite: 0 ppm
Ammonia: 0 ppm
Feeding & Nutrition
Feeding & Nutrition
Endler guppies are omnivorous and enthusiastic eaters, readily accepting most high-quality commercial fish foods sized appropriately for their small mouths. Standard flake foods are often too large and should be crushed into finer pieces before feeding. A vegetable-based flake or pellet makes an excellent daily staple, but the best health and coloration come from a varied diet.
Endlers eagerly accept frozen or live foods such as brine shrimp, grindal worms, bloodworms, tubifex worms, and other small invertebrates. Fry thrive on finely crushed flakes or specially formulated micro or powdered fry foods. Fry, juveniles and adults will also graze on naturally occurring algae within the aquarium.
To support optimal nutrition, The Endler Shop’s Special Blend Flake Food was developed specifically as a complete daily staple for Endlers.
Endlers are highly observant and quickly learn feeding routines. At feeding time, they often swarm toward the front of the aquarium, darting excitedly in anticipation. Many keepers even train their Endlers to respond to a gentle tap on the aquarium rim, signaling that food is on the way.
Behavior & Temperament
Behavior & Temperament
Endler guppies are tirelessly active and endlessly curious, constantly swimming through their environment, grazing on algae, interacting with one another, and investigating anything new that catches their attention. They are among the most inquisitive and fearless small freshwater fish, showing little hesitation even during routine tank maintenance. It’s common for Endlers to approach your hands, nibble curiously, or investigate a siphon hose while you work.
Although Endlers may appear to establish a loose pecking order, true aggression is virtually nonexistent. Any chasing is typically brief and non-confrontational. Adult males frequently “display” by flaring their fins, toward their reflection, other males, and especially females, yet their temperament remains mild and non-aggressive. They coexist peacefully with tank mates and rarely cause stress in community aquariums.
Endlers make full use of every level of the aquarium, showing no strong preference for top, middle, or bottom zones. As lighting fades, most will settle near the bottom to rest until lights return, though some may choose to sleep higher in the water column, particularly in community tanks where larger fish occupy lower areas.
Breeding, Fry & Hybridization
Breeding, Fry & Hybridization
Breeding at a Glance
Breeding at a Glance
Endler guppies are easy, natural breeders that require no special preparation. Males and females reproduce readily in standard freshwater aquariums, producing live, free-swimming fry approximately every 23 days in optimal conditions. Fry grow quickly, mature early, and are simple to raise with proper feeding and shelter. Because Endlers readily crossbreed with common guppies, Endler–guppy hybrids, and other livebearers, so to preserve wild genetics, avoid mixing species and choose documented N Class Pure Strain Endlers for breeding. See the Genetics section for additional details.
Breeding in depth
Breeding in depth
Male and female Endler guppies are easily distinguished. Males are smaller and vividly colored, displaying bold patterns and intense hues, while females are larger, fuller-bodied, and more subdued in coloration, typically appearing silvery or tan. Breeding occurs naturally whenever males and females share the same aquarium and requires no special preparation. Unlike many fish species, Endlers do not need altered water parameters, specific tank depth, specialized lighting schedules, plants, substrate, or precise male-to-female ratios in order to reproduce.
As livebearers, Endlers give birth to fully formed, free-swimming fry rather than laying eggs. Females can produce a brood approximately every 23 days. Like other poeciliid livebearers, female Endlers can store sperm from prior matings, allowing them to continue producing fry for many months, even up to a year, without males present, a phenomenon known as superfetation. Brood sizes generally range from 1 to 30 fry, depending on factors such as the female’s size, age, and overall condition. Although small at birth, fry are easily visible and begin swimming actively almost immediately.
Water temperature can influence fry sex ratios. Warmer temperatures tend to favor male development, while cooler temperatures favor females, with a roughly even (50/50) ratio occurring around 77°F.
Adult Endlers rarely prey on their own young; however, fry may be eaten by other tank mates. To improve survival rates, fry should be raised in densely planted aquariums with ample hiding areas, or moved to a separate grow-out tank until they are large enough to avoid predation. With frequent feeding, fry grow rapidly. Males reach breeding age and begin showing adult coloration within 3–5 weeks, though full color depth and intensity typically develop over several months. Females may begin producing small broods as early as 8 weeks of age.
Finally, it’s important to note that Endlers will readily hybridize (crossbreed) with common guppies, producing fertile offspring. Because Endlers are hybridized or believed to be extinct in the wild, this topic is often debated within the hobby. Many enthusiasts feel that Pure Strain Endlers should never be crossed in order to preserve their unique genetic traits, while others pursue selective hybridization to explore new combinations. For additional information on known Endler hybrids and detailed genetics discussion, see the Genetics section of the Details page.
Recommendations & Resources
Recommendations & Resources
👥 Population Control
Endlers reproduce rapidly, and just a few females can quickly produce more fish than most hobbyists expect. To slow population growth, keep more males than females, especially early on. Maintaining water temperatures around 78–80°F may also slightly increase male fry production.
Best practice: Fewer females + male-heavy ratios = slower population growth
🧬 Mixing Strains
Housing males and females of different Endler strains (such as Black Bar and Peacock) in the same aquarium will produce offspring with blended traits. To preserve Strain genetics, each strain should be kept in its own dedicated tank.
Best practice: Separate tanks preserve Strain traits
🐟 Natural Group Behavior
A group of 6–8 Endlers is sufficient to display their full range of natural behaviors, including active swimming, social interaction, and courtship displays.
Best practice: Groups of 6–8 show full personality and activity
🧪 Starting a Breeding Colony
For intentional breeding, 8–10 Endlers provide a solid genetic foundation and long-term stability.
Best practice: Start with 8–10 fish for healthy genetics
🏡 Stocking Density
The guideline of 1 gallon per two inches of fish works well. Higher densities are possible in heavily planted tanks or with increased filtration and maintenance.
Best practice: Plants + filtration allow flexibility
🤝 Compatible Tank Mates
Endlers thrive with other small, peaceful species and do exceptionally well in community set ups. Compatible tank mates include (but are not limited to): Corydoras catfish, Dwarf Corydoras, Neon and other small tetras, White Cloud Mountain Minnows, Honey Gourami, Glass Fish, Ghost and Cherry Shrimp, Otocinclus catfish, Zebra Danios, small Rainbowfish, Bolivian Ram cichlids, and African Dwarf Frogs. They also excel in single-species tanks, where their constant curiosity and nonstop activity truly shine.
Best practice: Calm, non-aggressive tank mates only
🌊 Water Current
Endlers prefer gentle to moderate water flow and should not be exposed to strong or turbulent currents.
Best practice: Gentle, even circulation
⚗️ pH & Water Hardness Importance
Endlers and most livebearers prefer harder, mineral-rich water. Low pH or hardness often causes lethargy or poor appetite. Aim to keep water in the “hard” range according to standard test kits. Crushed coral in the filter or Wonder Shells can help stabilize stabilize pH while replenishing essential minerals.
Best practice: Harder water = healthier Endlers
🧂 Salt Tolerance
Endlers tolerate salt well but do not require it. If used, start with 1 tbsp per 5 gallons and confirm all tank inhabitants can tolerate salt.
Best practice: Optional only, never required
🔒 Cover Your Tank
Endlers are notorious and strong jumpers. Always keep your aquarium covered to ensure their safety.
Best practice: Always use a secure lid
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