How to Care for Fire Belly Newts?

My local pet store has two fire belly newts for sale and I'm considering purchasing them. I would like to know how to care for them first. Should I keep one or two? How big does the tank need to be? What substrate do I use? What about cage decorations? What do they eat? The ones at the pet store are in the same tank right now, so I'm guessing they get along fine. Any information about fire belly newts is appreciated.

Gravels, plants, light, and water. I like to keep a male better.