Check the ingredients and size
Algae wafers are often made for aquarium herbivores and may be eaten by shrimp. Their size can exceed what a small colony needs, particularly when fish and snails are absent.
Break off a small piece and see how the shrimp respond. A complete shrimp food may be a more consistent staple than a food intended for another species.
Avoid using food as a cleanup fix
A wafer does not remove algae from the aquarium; it adds food and nutrients. Remove what remains and adjust the portion if the colony does not finish it.
Track whether other animals reach the wafer first. Feeding extra to compensate for competition can create more waste than the shrimp can use.
For your own tank
Break the wafer into a small piece and track how quickly it softens. Remove anything left behind before it clouds or decomposes. If fish take the portion first, a protected feeding location may help, but adding more food is not automatically the answer.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.