Terrarium Setup: Low, terrestrial enclosures completely dense with dark hiding spots (minimum 36x18 inches / 80x40 cm floor space for a pair). Paludariums or deep water setups are strictly forbidden: they are clumsy swimmers and will tragically drown. The substrate must be deep (4-5 inches / 10 cm) using rich, organic topsoil or coco-coir kept perpetually damp, thickly covered with sheets of live moss and garbage bags' worth of dry beech/oak leaf litter. Liberally bury curved cork bark tubes directly into the dirt to create freezing, dark, cavernous burrows. A very shallow water dish is all they need to drink from.
Lighting and Heating: HEAT IS THEIR ABSOLUTE DEATH SENTENCE. They are European creatures of freezing, dark woods: their optimal temperature zone sits firmly around 59-64°F (15-18°C). They DO NOT TOLERATE prolonged temperatures over 72-74°F (22-23°C), entering severe metabolic suffocation and distress. In summer, if your house hits 77°F (25°C), they MUST be moved to a cold basement, a wine cooler setup, or a room with dedicated A/C. In winter, they thrive in the cold and can easily undergo artificial hibernation (brumation) in a fridge at 41-46°F (5-8°C). Provide very weak LED lights solely for viewing; heavy UV lighting is not strictly required for them.
Humidity and Hydration: Being bound to the ground without protective scales, they require permanently high humidity (75-90%). The soil should feel like a wrung-out sponge, cool and wet to the touch (but not flooded into an asphyxiating mud soup). Gently spray or water one side of the terrarium twice a week, always ensuring there is a slightly drier gradient on the other side. A bone-dry terrarium will lock up their skin-shedding process and lethally mummify the salamander in a matter of days.
Feeding and Supplementation: Gluttonous, placid, but infallible devourers. They locate prey in pitch blackness by combining excellent night vision with a highly acute sense of smell. They will happily devour tons of live earthworms/nightcrawlers (their absolute supreme, perfect staple food), small shell-less slugs, isopods, calcium-dusted crickets, and soft roaches. They inexorably tend toward lethal clinical obesity in household captivity: once adult, they must be fed very sparingly, offering large earthworms via tongs no more than 1 or 2 times a week.
Compatibility: Perfect, peaceful tank mates. You can comfortably house large groups together in appropriately sized enclosures, as they are completely peaceful, show zero territorial aggression, and almost never bite each other—unless two accidentally strike at the exact same earthworm. Their reproduction is utterly unique: the mating amplexus is done completely on dry land (not in the water), and the female gestates the eggs internally for months, eventually backing her rear into a very shallow stream (or a plastic tub provided by the keeper) to drop dozens of fully formed, swimming, gilled larvae directly into the water.
Health and Common Diseases: Bsal (Batrachochytrium salamandrivorans): An apocalyptic, lethal Asian fungus currently wiping out wild European salamander populations, literally eating the animals' skin alive in necrotizing ulcers. Captive European stock must be strictly and fiercely isolated from any newly imported Asian newts to prevent catastrophic tank crashes. Thermal Intoxication (Heat Stress): If kept at typical 'summer apartment' temperatures (80°F / 27°C+), their immune system completely shuts down, they refuse all food, their shedding skin gets permanently stuck to them in choking rags, and they quickly die from massive multiple organ failure.