Look at how many animals are involved
One shrimp climbing a plant or filter may be exploring. Many shrimp clustering near the surface at once is more concerning, especially when the behavior is new.
Check whether they are upright and moving normally. A photograph can help record the observation, but it cannot show water chemistry.
Check the aquarium first
Confirm the filter is running and the surface is not sealed under an unusual film. Test ammonia and nitrite if the system is new, recently disturbed, or showing broader stress.
Review temperature, recent water changes, and any new products. Do not add medication or chemicals before identifying what changed.
Make a measured response
If equipment has failed, restore safe circulation and follow established aquarium guidance. Keep changes gradual when the shrimp are already in the tank.
If surface clustering persists or deaths occur, seek help from a qualified aquatic professional and provide test results and a timeline.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.