Guppy grass (Najas guadalupensis)
 Guppy grass is 
Guppy grass (Najas guadalupensis)  is a fast-growing, freshwater aquatic plant commonly used in aquariums and ponds. It features slender, branching stems with delicate, narrow green leaves. Known for its ability to oxygenate water and provide shelter for fish and fry, guppy grass also helps control algae by absorbing excess nutrients. It thrives in a wide range of water conditions, making it ideal for both beginners and experienced aquarists. This plant can float freely or be anchored in substrate and propagates easily through cuttings.