I agree with Xavier its most likely Paramesotriton chinensis. Do the other two look Identical? I ask because I've often seen mixed species of warty newts for sale under one name.
Unless they are captive bred, which they almost certainly aren't, they will be a mature adults, so they can be housed in an aquarium with a small island or cork float.
If you are keeping them together keep an eye out for fights, warty newts are highly territorial and aggressive especially males so be prepared to separate them if need be.