Salvinia molesta

Species description

Care, breeding and tankmates

Plant profile

Placement

Floating

As a floating plant, Salvinia molesta belongs on the surface of the aquarium. It should be placed in areas with gentle water movement to prevent it from being submerged or pushed around aggressively. Floating rings can be used to contain its spread and protect the surface agitation area. This placement provides natural shade for fish and lower-light plants.

Botanical form

Floating

It features distinctive, small floating leaves that often possess a velvety texture due to tiny water-repellent hairs. The roots dangle freely into the water, providing a beautiful natural aesthetic. The leaves are typically arranged along a central stem, creating intricate patterns on the surface. This unique structure helps it remain buoyant and stable.

Growth

very-fast

This plant has an incredibly fast growth rate when provided with adequate light and nutrients. It can quickly cover the entire water surface, potentially blocking light to submerged plants. Regular removal of excess growth is essential to maintain a balanced ecosystem. Its rapid growth makes it an excellent tool for combating algae.

Substrate

None

Column fertilization

Recommended

Liquid fertilization is the only effective way to feed Salvinia molesta. A comprehensive fertilizer that includes both macronutrients and micronutrients is vital for its health. Because it grows so quickly, it can deplete water column nutrients rapidly, requiring consistent dosing schedules. Avoid direct application of concentrated fertilizers on the leaves.

Root fertilization

None

Root fertilization is not applicable for Salvinia molesta as it does not root in the substrate. Its trailing roots absorb nutrients directly from the water. Therefore, focus entirely on maintaining nutrient-rich water conditions. A healthy substrate benefits the overall system but does not directly feed this plant.

Trimming

Regular

Maintenance involves physically removing excess plants from the water surface rather than trimming them with scissors. Scooping out a portion of the colony weekly prevents it from blocking too much light. Ensure that discarded plants are disposed of properly and never introduced into local waterways. Regular thinning keeps the remaining plants healthy and vibrant.

Propagation

Cuttings

Propagation is incredibly simple and occurs spontaneously. The plant naturally fragments, and new shoots develop continuously from the main body. Even a small fragment with a few leaves can multiply into a large colony within weeks. No special effort is required to encourage this natural and rapid division.

Sensitivity

Moderate

While generally hardy, Salvinia molesta is sensitive to strong surface agitation and excessive splashing, which can sink or damage its delicate leaves. It also dislikes condensation dripping onto its surface in closed-lid aquariums. High humidity combined with poor ventilation can lead to leaf rot. Ensure adequate airflow above the water surface for best results.

Layout role

Floating, Background

In the aquascape, Salvinia molesta serves to create a natural, shaded environment reminiscent of a tropical stream or pond. The dangling roots provide a sense of depth and offer excellent hiding places for fry and small fish. It helps to diffuse intense lighting, creating a softer mood for the tank. Additionally, it aids in biological filtration by absorbing excess nutrients.