Dwarf Salvinia

About

A tiny floating fern found across much of the world, Salvinia minima is one of those plants that rewards beginners almost immediately. Each frond is only about an inch or so across, covered in fine surface hairs that bead water right off the leaf. A clever adaptation that keeps the foliage dry even as the plant drifts across the surface. Those hairs also give the leaves a subtly textured, velvety look up close. In the wild this species can spread aggressively given good light and nutrients, forming dense mats that shade the water below, and it behaves the same way in an aquarium. That shading habit is actually useful. A loose layer of Salvinia minima at the surface competes with algae for nutrients and blocks some light from reaching the water column, which can help keep nuisance algae in check. The trade-off is that plants growing beneath it will need enough light to work around the shadow, so coverage is worth managing. Yellowing or pale fronds usually signal a shortage of micronutrients rather than a lighting problem. This is a good choice for open-top tanks and biotope setups, and because it needs no substrate and tolerates a range of conditions, it is genuinely one of the more forgiving aquatic plants available.