Demo
Save the Little Fish demo · Medium, 30–40 gal · calm, like a pond or swamp · running 559 days · shared October 2026
Hardy, colourful and forgiving: a good first community tank in harder tap water.
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Livebearers · PoeciliaStaple
Long fins. Fin nippers will pick on it.
Poecilia reticulata
Trinidad and northern Venezuela · stream
Long fins. Fin nippers will pick on it.
Photo: Holger Krisp, CC BY 3.0
× 6
Expect fry within a month.
Xiphophorus maculatus
Atlantic slope of Mexico and Central America · stream
× 5
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Corydoras · CorydorasStaple
Corydoras aeneus
Widespread in South America · stream
Photo: Andrew Keller, CC0
× 6
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Plecos · AncistrusStaple
Yellow bristlenose with blue eyes.
Aquarium-bred strain. Its wild origin isn’t well documented. · river
Yellow bristlenose with blue eyes. Easy and cheap, but happier below 28°C. L144a is the longfin form.
Photo: Corydoras-adolfoi, CC BY-SA 4.0
× 1
One bristlenose keeps the glass clean.
Every species is comfortable in this range.
No two species here can cross, so any fry that turn up are pure.
A rough estimate based on adult body size and tank volume.
One per fish plus two spares, so nobody has to fight for a spot.
Something at the top, in mid-water and on the bottom, so the whole tank looks alive.
Size and stocking checks use a typical tank of the size you picked. Add the real length and volume for a sharper answer.
Care data for Bronze corydoras, Guppy, L144, Platy is estimated or taken from the genus, not yet checked against a source.