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Guppy Grass (Najas guadalupensis)

Guppy Grass is a brittle, fast-growing stem plant that can be planted, left to float, or wedged into hardscape, making it one of the most flexible nutrient exporters in the hobby. It needs no CO2 and very little light, and its dense tangle is a favorite spawning and fry-shelter plant for livebearers and egg-scatterers alike. It grows fast enough to need frequent thinning, and stray fragments will keep multiplying.

Care specifications

TypeStem
DifficultyEasy
LightLow (15–70 µmol PAR)
CO2Not needed
Fertilizer demandLow
Growth rateFast
Max height24 in
Spread10 in
PlacementBackground, Floating
Attaches to hardscapeNo
Snail & shrimp safeYes
Temperature64–86 °F
pH6–8
ColorGreen
TrimmingFrequent
StylesJungle, Biotope

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Guppy Grass

Guppy Grass (Najas Guadalupensis)

$6.99 Out of stock

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Propagation

Snap off any fragment and it will grow into a new plant; it self-propagates so readily it often spreads on its own.

Frequently asked questions

Why is Guppy Grass recommended for breeding tanks?

Its fine, tangled growth gives newborn fry and scattered eggs dense cover from hungry adults, and it floats or anchors anywhere. Combined with fast nutrient uptake that keeps water clean, it is close to ideal for fry survival.

Is Guppy Grass hard to control?

It can be. The plant is brittle and every broken fragment regrows, so it spreads quickly and you will be netting out excess regularly. Never release trimmings into local waterways.

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