Hi there.
I'm by nature an aquarist who loves to biotype my aquariums, so I tried to do the same with my paddle tailed newt.
So, what I have done is this:
Substrate: Fine to medium sized gravel of various shades, shape, and rock....this mimics a typical riverbed. ( They are said to be from flowing, well oxygenated streams. )
Backing: Since the tank is dimly lit, and the gravel & boulders within are mostly darker, I used crinkled brown paper to add contrast. But it also serves as a representation of a sandy colored river bank, adds depth, and allows me to see the newt.
Decor: Nothing but rocks....since they tend to be reclusive, and I didn't plan on lighting or plants, boulders worked well. In one corner of the tank there is a series of smaller rocks built up to hide the filter ( listed below ) and on the other end there are larger ones that hold up a flatter piece....which allows him to get out of the water. All rocks are of the same kind, generally rigid and scarred ( as oppossed to rounded river rock. ) The middle is open, while the sides are covered to make him feel secure.
Filter: Duetto, hidden by rocks. This spills water onto the water surface creating a pleasant noise as well as oxygenation. As an extra bonus, the small air bubbles splashing into the water mimic the flow of a stream.
Lighting: A DIY project. At first I wanted to use a spotlighting method to create a window of light....but the project took it's own course. Basically, it is a nightlight with the sensor blocked off....it is set into a "lamp" made a disposable mealworm container. Then it's set ontop of the lid!
Simple....but the effect is quite nice.
All in all, I say it produces a very natural and biotypically correct home for him.
( My firebelly newts, in comparison, have sand with live plants...)