How are these as final definitions:
Carnivore (adj, carnivorous): An animal that feeds only on other animal organisms. In contrast, omnivores eat both plants and animals, and herbivores eat only plants. Nearly all salamanders are strictly carnivorous.
Predator: An animal that lives by preying on and capturing live animals to eat. Nearly all salamanders are predators and strictly [carnivores].
Scavenger: An animal that feeds on dead organisms, especially [carnivores] that eat dead animals rather than hunting live prey.
Detritivores: Scavengers that eat dead plant and animal material. Healthy [aquariums] contain an assortment of detritivores, which transform aquarium [detritis] into [mulm]. Soil-based [terrariums] also contain detritivores. Detritivores range in size from microscopic to easily-seen, and include creatures such as protozoa, tiny worms, snails, etc. See [Tank Critters article]. Detrivore definiton was finalized elsewhere in this glossary project.