Guppy Grass

Guppy Grass

Guppy Grass, botanically Najas guadalupensis, is one of the most fast-growing and practically useful aquarium plants available — a North American aquatic plant producing fine, narrow, dark green leaves on flexible, branching stems that create ideal natural habitat and cover for fry, shrimp, and fish that appreciate dense, natural cover. Its common name reflects its longstanding popularity in guppy breeding tanks where the dense, fast-growing stems provide critical survival cover for new fry.

Care tip: Guppy Grass is a floating plant that grows on the water surface without substrate. Avoid strong surface agitation and thin regularly to prevent complete surface coverage. Temperatures between 68–82°F support healthy growth.

Growing to 12 to 20 inches, Guppy Grass can be planted loosely in the substrate as a background plant or left to float freely where it grows most vigorously and provides the most natural fry cover. Its extraordinary growth rate under any reasonable conditions — from low light to high light, with or without CO₂ — makes it one of the most practical and adaptable aquarium plants available. Regular thinning manages the fast growth.

This easy plant requires no CO₂ supplementation and grows in moderate lighting. The exceptionally wide pH range of 6.0 to 8.0 and broad temperature range of 68 to 82°F reflect genuine, cosmopolitan adaptability. Regular thinning is the primary management task for this fast-growing species. No fertilization is required in tanks with reasonable bioload.

In the aquascape, Guppy Grass provides fast, natural, fine-textured background or floating coverage that creates ideal habitat and fry cover. In breeding tanks and fry-rearing setups it is one of the most effective and universally recommended natural cover plants. In community tanks it provides fast, reliable natural habitat structure alongside its background aesthetic appeal.

Guppy Grass is the quintessential fry-tank plant — fast, adaptable, and providing the most effective natural fry cover available from any commonly kept aquarium plant. Its extraordinary adaptability and natural cover quality make it an essential and universally practical aquarium plant for breeders and community tank keepers alike.

Care & Specifications