Tank Math Lab

Freshwater fish group

Livebearers

Hardy community fish that give birth to live young and often suit moderately hard water.

9 profiles in this category. Each card uses a small directory thumbnail; open a profile for the larger reference image and full care notes.

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Guppy (Poecilia reticulata) in an aquarium

Livebearers

Guppy

Poecilia reticulata

4 cm adult10 gal minimum

Generally peaceful, but long fins need calm tank mates. Breeds readily; plan for fry.

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Molly (Poecilia sphenops) in an aquarium

Livebearers

Molly

Poecilia sphenops / latipinna

9 cm adult29 gal minimum

Generally peaceful in a suitable community. Prefers hard, alkaline water.

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Green swordtail (Xiphophorus hellerii) in an aquarium

Livebearers

Green swordtail

Xiphophorus hellerii

10 cm adult29 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

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Mosquitofish (Gambusia affinis) in an aquarium

Livebearers

Mosquitofish

Gambusia affinis

6 cm adult20 gal minimum

Generally peaceful in a suitable community. Hardy but prone to chasing; never release into natural waterways.

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Variatus platy (Xiphophorus variatus) in an aquarium

Livebearers

Variatus platy

Xiphophorus variatus

6 cm adult20 gal minimum

Generally peaceful in a suitable community. Breeds readily; plan for fry and provide moderately hard water.

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Least killifish (Heterandria formosa) in an aquarium

Livebearers

Least killifish

Heterandria formosa

3.5 cm adult10 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

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