I had a couple of the reb bellied newts a while back. They were a bit hard to care for in my opinion and I ended up losing both of them. What I did was take a 10 gallon (US) tank and put gravel in to make a higher side for "land" and a lower side with water. Then I had a small filtration unit for an amphibian tank which just ran off of an air pump. Problem was neither of them ever went in the water at all! They just stayed in one corner of the land part and never moved unless I moved them. To feed them I woudl put meal worms right in front of their noses and maybe once every 2 weeks one of them would actually attack one and eat it. I really think starvation is what killed the first one. I tried putting them in the water with brine shrimp, small feeder fish, tubifex worms and nothing worked. After the one died, I took my chances with the other one and put it in the tropical community tank. Now mind you, in the past, I had kept them in community settings so figured nothing from nothing, maybe I'd succeed with him. Well all was ok for a few days and then he disappeared! We searched the tank really well and all around it. We have even moved since then and never found anything anywhere in the apartment! Strange, huh? We think possibly it crawled up in the trim around the top of the tank but have never smelled it or anything.
Let me know how you fair with yours as I would love to have some more but the last bad experience has made me shy away!
Allie