Amphibian — grooming (owner-practical care, Merck Veterinary Manual pet-owner)
Source: first-hand Merck Veterinary Manual pet-owner text, saved to source_file; every claim below is a C1 byte-substring of it.
Claims
Some aquatic amphibians need gentle water filtration that keeps water clean without creating strong currents.Because amphibian skin absorbs water easily, it also absorbs toxins.In established aquatic tanks, at least 10% of water should be changed weekly.Spot cleaning of cage-floor coverings should be done daily to weekly, and floor coverings should be completely replaced every few weeks to months, depending on the covering used.However, mosses, hardwood mulches, and soil support the development of helpful microorganisms, so small portions of these floor coverings should remain in the enclosure with each cleaning.Most amphibians have moist skin coated with a mucus film known as a slime layer.Adult amphibians breathe through lungs and also through their skin, which must stay moist for oxygen exchange.Amphibians can be good pets, but they should be handled as little as possible because their skin is delicate .
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Source: pdf-raw/owner-care/merck_amphibian.txt · https://www.merckvetmanual.com/all-other-pets