Shape surfaces and shelter
Wood and inert aquarium stones add structure and create surfaces that develop biofilm. Arrange them so shrimp can move through gaps without trapping themselves and so you can still reach the back of the tank.
Before adding a rock or branch, confirm it is intended for aquarium use and will not release unknown coatings or contaminants. Avoid sharp edges where animals could be injured.
Keep the layout maintainable
Anchor light wood or moss so it cannot shift during cleaning. Leave a clear area for feeding and check that the filter can circulate water around the hardscape.
A dramatic pile can look attractive but become hard to clean. Prioritize stable placement and accessible surfaces over a wall of decor.
For your own tank
Before filling the tank, gently test each hardscape piece for wobble and plan how you will reach behind it. Leave space around the filter and avoid narrow traps where debris collects. A stable, serviceable layout is easier to maintain than a tightly packed display.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.