The first question is which skink you are really buying
Blue tongue skinks are not one interchangeable pet. Northern and other Australian types are established in captive breeding and generally suit drier conditions, while Indonesian types such as Halmahera animals need markedly more humid keeping and are still frequently imported rather than bred. A seller who cannot or will not say which type an animal is, or who labels every skink with whichever name is fashionable, is asking you to guess at its care for the next two decades. A good breeder states the type plainly, explains why they work with it, and sets your humidity and feeding expectations around that animal, not around the species in general.
Captive-bred claims deserve polite verification
Ask where this skink was born and be ready to hear an honest answer either way. Captive-bred babies from a named pairing, with photographs of the parents and a birth season the breeder can describe, are straightforward to verify in conversation. An imported animal is not automatically a poor choice, but it should be presented, described, and quarantined as what it is, and it should have been in the seller's care long enough to be feeding confidently and gaining condition. Rescues can be an excellent route to an adult Indonesian type, since these skinks are often surrendered when their humidity needs or adult size were never explained to the first owner.
Judging the animal in front of you
A healthy blue tongue skink is a solid, low-slung animal that pushes off strongly with all four limbs, flicks a clean pink-to-blue tongue, and breathes without clicking or bubbles at the nostrils. Examine the toes carefully, because retained shed on this species commonly constricts and costs toes kept in the wrong humidity, and check that the tail is complete and the body free of lumps, crusty patches, or mites around the ears and scales. Watch it eat if you can. A skink that approaches food with enthusiasm and swallows comfortably is showing you more about its health than any sales description can.
Housing and diet talk that signals a serious source
A trustworthy breeder or rescue will describe adult housing in terms of generous floor space, deep substrate for burrowing, a warm basking area, and a large water bowl, and will ask what you have prepared. Diet conversation should range widely: quality protein, varied vegetables and greens, some fruit as a treat, and a feeding rhythm that keeps this famously food-loving lizard lean rather than round. Be cautious with a seller whose adults look obese, whose enclosures are bare tubs with no digging depth, or who suggests a skink thrives on a single convenient food. This is a hardy species, but hardy is not the same as indifferent to care.
Settling an adult, and knowing when to get help
Give a rehomed skink time to learn new smells and a new feeding routine, and keep handling calm and well supported, since a heavy body dropped even a short distance can be seriously hurt. A reptile-experienced veterinarian should see a skink that breathes noisily, loses toes to repeated stuck shed, stops eating while its condition thins, or develops swellings along the jaw or limbs. The detail that protects this animal long term is an accurate written history, and KinsLe's Transferrable Profiles keep its confirmed type, humidity routine, and food record moving with the skink whenever it changes homes.