Floating Crystalwort

About

Floating crystalwort (Riccia fluitans) is a cosmopolitan liverwort found naturally on the water surface of ponds, lakes, and slow-moving streams across much of the world. In its wild form it drifts freely at the surface, forming dense bright-green mats, but aquascape enthusiasts, most famously the late Takashi Amano, popularized the technique of anchoring it underwater to rocks or driftwood using thin fishing line, creating lush, low-growing cushions of vivid green. This submerged look is what most planted tank keepers are after, though the plant has its own ideas: new growth always pushes upward toward the light, so regular trimming is part of the routine. When conditions really click, good light, added CO2, balanced nutrients, the leaf tips will begin releasing tiny oxygen bubbles in a process called pearling, which is genuinely satisfying to watch. Left to float freely, it serves a more traditional role as surface cover, offering shelter and a sense of security for small fish and fry. This is not a set-it-and-forget-it plant; it rewards consistent maintenance and a well-dialed setup. Intermediate keepers comfortable with CO2 injection and regular pruning will get the most from it.