Why debris pockets matters
Narrow gaps behind rocks can collect waste and make it hard to inspect or clean the aquarium. In a shrimp-focused aquarium, the choice should also support steady routines, visible livestock, and access for basic care.
Before you act, check whether you can see behind the stone and reach the substrate below. Compare the item with the rest of the setup and note any recent change that could affect what you are seeing.
A careful way to proceed
adjust spacing before planting and observe where detritus settles. Make one adjustment at a time and watch how the aquarium responds during normal observation.
Avoid sealing a gap with plants before checking whether it needs cleaning. Labels, products, and tank conditions differ, so use a reliable guide as context and record what you directly observe. If uncertainty remains, ask an experienced shrimp keeper before making a consequential change.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.