Flatworm

Aquatic environments, including freshwater ponds and saltwater reefs, often found on glass or substrate in aquariums.

Carnivorous; many species prey upon small invertebrates, coral polyps, or scavenge organic detritus.

Slow-moving, gliding motion using cilia; often nocturnal and can rapidly multiply through fission or egg-laying in stable environments.

Generally considered a pest in aquariums as they can smother coral or compete for food, but some species serve as scavengers in natural ecosystems.