As long as you offer him the proper temp gradient, a water bowl, and two hides for each side of his tub or cage, the rest is all about what YOU like. Decorating in a tank/tub is mainly for your aesthetic pleasing.
That said, if it's too big of an enclosure, then adding decorations like extra hides, plants, statues, etc. will help your snake feel more secure.
In order to truly answer your question, we need to know what type of enclosure (tank, tub, other) you have and how big is it.
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