Check every opening
Shrimplets are tiny and can be drawn into exposed filter intakes. A sponge prefilter or purpose-built fine guard creates a barrier while letting water reach the filter.
Match the guard to the intake diameter and keep it firmly seated. A loose cover can leave a gap, while a clogged one can reduce flow.
Balance safety and circulation
Check the intake after feeding and routine maintenance. If debris coats the sponge quickly, rinse it gently in old tank water and confirm that the filter still moves water as intended.
Do not solve clogging by removing the guard while babies are present. Choose a coarser or larger prefilter only if it still prevents shrimp from reaching the intake.
For your own tank
During routine checks, inspect the prefilter for tears, loose edges, and a layer of debris that blocks water. A safe intake still has to move water. If you change the guard, observe the shrimp and verify filtration before considering the task complete.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.