Guppy Grass ~ Najas guadalupensis

Guppy Grass is a fast-growing, hardy freshwater plant known for its dense, feathery appearance and ability to provide excellent cover for small fish and fry. Native to the Americas, it thrives in a variety of water conditions and is highly valued in breeding and shrimp tanks for its ability to create a safe, natural habitat. Its rapid growth and adaptability make it ideal for beginners and experienced aquarists alike.

• Type: Stem plant
• Size: Variable, can grow up to 3 feet in length if left unchecked
• Light: Low to high (6-10 hours daily)
• Substrate: Not required; can float or be anchored in the substrate
• CO2: Not necessary but promotes faster growth
• Water Requirements: 68-82°F, pH 6.0-8.0, soft to moderately hard water
• Growth Rate: Fast

In the wild, Guppy Grass is found in slow-moving rivers, lakes, and ponds across the Americas. It thrives both as a floating plant and when lightly anchored in the substrate. In aquariums, it grows quickly and can easily overtake a tank, so regular pruning is essential to maintain balance. Its adaptability to low or high light and its lack of need for CO2 or fertilizers make it a low-maintenance option for most setups. It’s particularly useful in breeding tanks, where its dense growth provides shelter and spawning surfaces for fish and shrimp.

Guppy Grass is a versatile addition to aquascapes, useful for filling in empty spaces or creating a natural look. Its rapid nutrient uptake makes it effective for controlling algae and improving water quality. However, it can be fragile, and its stems may break easily during handling or maintenance.

Interesting Fact: Guppy Grass gets its name from its popularity in guppy breeding tanks, where it provides excellent hiding places for fry, increasing their survival rate by keeping them safe from predatory adults.