Guppy vs Endler's Livebearer
Two dazzling, hardy livebearers that breed like clockwork. The guppy brings bigger fancy tails; the Endler packs metallic colour into a thumbnail-sized nano fish. Here's which suits your tank.
The quick verdict
Both are beginner-friendly and want the same hard, alkaline water, so this is mostly about size. Choose the Endler's livebearer for a small planted nano and intense, jewel-like metallic colour. Choose the guppy if you have a slightly larger tank and love the flowing fancy tails and huge colour variety. Both breed freely, so plan for fry either way.
| Guppy | Endler's livebearer | |
|---|---|---|
| Care level | Beginner | Beginner |
| Min tank size | 40 L / 10 gal | 20 L / 5 gal |
| Temperament | Peaceful | Peaceful |
| Adult size | 3–6 cm | 2.5–4 cm (nano) |
| Water | Hard, pH 7.0–8.0 | Hard, pH 7.0–8.5 |
| Best for | Fancy tails, colour variety | Nano tanks, metallic colour |
The real differences
The headline is size. An Endler stays under 4 cm and shines in a 20-litre planted nano; a guppy grows larger and wants 40 litres or more, especially the long-finned fancy strains that struggle against current. Guppies win on sheer variety and those trailing tails, while Endlers win on compact, high-intensity metallic green and orange. Both are livebearers with near-identical water needs (hard, alkaline), and crucially they interbreed — so house them separately if you want to keep either strain pure.
Which should you buy?
Our pick
Short on space or building a planted nano? The Endler's livebearer is one of the best colourful nano fish going. Want the classic fancy tails and endless colour morphs in a slightly bigger tank? The guppy is the icon for a reason. Read the guppy care guide and Endler care guide, and browse our best nano aquarium picks.
Frequently asked questions
What is the difference between a guppy and an Endler?
Endler's livebearers (Poecilia wingei) are a close relative of the common guppy — smaller (2.5–4 cm), with intense metallic colours and shorter fins. Guppies grow larger (up to 6 cm) and come in long fancy tails. The two readily interbreed, so keep them apart if you want pure strains. Care is very similar.
Are Endlers or guppies better for a nano tank?
Endlers. Their tiny adult size means a group thrives in a planted 20-litre nano, whereas guppies want 40 litres or more. Both need hard, alkaline water, so the choice mostly comes down to tank size and whether you prefer flowing fancy tails or compact metallic colour.
Do both guppies and Endlers breed a lot?
Yes — both are prolific livebearers, and a mixed group of either produces fry continuously. For a stable population keep a single sex, or expect and plan to manage regular batches of young.
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