pairs of adult smooth/ common newts   
The smooth newt (Lissotriton vulgaris) is one of 3 native species of newts, the other 2 being the palmate newt ( lissotriton helveticus) and the great crested newt ( triturus cristatus ) . smooth newts are small to medium sized newts larger than palmate newts but smaller than the great crested newt reaching a max size of around 11 cm smooth newts can live up to 14 years possibly even longer. Breeding males develop a large crest along there back resembling the great crested newt which they are sometimes mistaken for ,They spend most of their time in the water during the breeding season ,spring to early summer , but come back on to land in late summer to feed and hibernate in late autumn where they will hide in rock or wood piles through the winter. smooth newts while in water, feed on aquatic insects, worms, midge larvae and tadpoles. On land they mostly feed on earth worms and small insects. At Wildlife Pond and Aquarium we have captive bred smooth newts over many generations to ensure they are disease free and legal to sell (sale of wild caught newts is illegal). Each group will include a pair of adult male and female newts and will be an excellent breeding colony .
CAPTIVE CARE :
Smooth newts are easy to care for in captivity ,a paludarium set up is best smooth newts are the most terrestrial of the native newts and spend most of there time on land so better to have more land than water in the enclosure, a natural set up is best with a substrate of soil or coconut coir , lots of plants ,moss some rocks or wood  and of course a water container , we keep our amphibians in bioactive setups with lots of worms ,springtails ,woodlice and other insects living the soil ,these as well as helping keep the enclosures clean also provide a natural food source for the newts ,life span of smooth newts is around 15 years but they can live up to 20 in the right conditions ,ensure the lid of the enclosure is secure as there good climbers and can can squeeze through narrow gaps.
FEEDING :🐛
Smooth newts will eat a wide range of foods 
most standard insect foods are suitable ,make sure  the food is the right size for the newts and not to big ,foods Including:
Crickets 
Mealworm
Waxworm 
Earth worm
Calci worm
White worm 
Isopods ( woodlice )
Beetles
And flies
While commonly stated newts will eat snails and slugs these don't tend to be preferred ,
 When the newts are living in water they can be fed most Live /frozen foods
Bloodworm
Daphnia
Krill
Gammarus
Tubifex
Blackworm
Water Louse
Midge/ mosquito larvae
As with all amphibians and reptiles in captivity smooth newts require a calcium supplement in there diet ( dusted over there food ) to avoid getting metabolic bone disease ( MBD ) ,a supplement with both calcium and additional nutrients is best ,we  use arkvits but there's many different suitable brands ,foods like calci worm and isopods are also an excellent source of calcium for the newts.
TEMPERATURE 🌡️
Between 12°C and 25°C
HIBERNATION TEMPERATURE ❄️ 🌡️
between  2 °C and 5 °C 
Smooth newts don't require hibernation unless you want to breed them.
HUMIDITY 🌧️
85 - 100%
BREEDING:
Smooth newts must have a hibernation period  to breed successfully ,this can be done naturally by keeping them in an outdoor enclosure over winter or artificially by keeping them in a fridge for 2 to 3 months at  2 °C to 5 °C  ,the fridge must have  accurate temperature control with a decent amount of space inside to ensure enough air flow, a faunarium or storage container with air holes is a perfect hibernation enclosure doesn't need to be too large as there not very active during hibernation but depends on how many newts you have ,a substrate of soil and lots of damp sphagnum moss to keep the newts moist but not soaking ,a small water bowl is also important ,check them around once a week and give them a spray if they seem dry ,always feed them up well in the weeks before hibernation so there in good condition and have enough fat reserves.
 Smooth newts reach sexual maturity from 1.5  to 3 years depending on temperature and food availablity ,when ready to breed the males will take on brighter colours and develop a large crest similar to the great created newt ,tail fanning from the male is a clear sign the newts are in full breeding mode , After mating the female will begin to lay eggs usually on the leaves of aquatic plants where she will carefully fold the leaf around the egg with her back feet and can keep laying between 30 and 300 eggs in a 3 to 4 month period ,they can take anywhere from 2 weeks to a month to hatch depending on temperature.
LIGHTING 💡
While it's disputed by amphibian keepers if newts and salamanders need UVB lighting as they are mostly nocturnal and wouldn't have much exposure to sunlight naturally ,we use UVB lights for all our amphibians , even though the newts wouldn't have much sun exposure in the wild they would still experience brief periods of sunlight as they squiggle through the undergrowth ,a 5%  UVB is sufficient for them but UVB certainly isn't essential for this species.
TANK MATE'S 🦎
Smooth newts can be kept with other similar species including palmate newts and alpine newts  , provided the enclosure is decent enough size for each animal to have there own space , these species are all found in close proximity in the wild and share the same habitat and will even hibernate together, many of the crested newts triturus.sp also share the same habitat and have  similar care needs and could be kept in the same enclosure when small ( only in a large enclosure ) although these newts grow much larger than smooths , palmates or alpines and once they start to outgrow there smaller tank mates would need moved to there own enclosure.
There are many different methods of keeping amphibians in captivity and different keepers and breeders have there own methods ,our advice is based on our own experience and what we've had the most success with in our own animals.