Cabomba aquatica is one of the most well known aquatic plants as it's been around since the hobby began. A great oxygenator, it does need a lot of light in order to flourish. But once it does, it sways beautifully in the current. Trim this plant regularly otherwise it becomes bare at the bottom. The least demanding of the Cabomba-species, but still causes problems in poorly lit aquariums. If there is not sufficient light, try Limnophila sessiliflora, which requires less light.
Cabomba does not have roots.