Food types behave differently
Some shrimp foods are designed to soften slowly, while vegetables and soft foods can break down faster. The same portion may be safe in one tank and excessive in another.
Use a feeding dish to make the serving visible. Check the manufacturer's instructions and observe how the colony handles that particular food.
Remove what the shrimp do not finish
If food remains or clouds the water, remove it and reduce the portion next time. A small tank can accumulate waste quickly.
Do not assume that shrimp will clean every scrap. They graze on many surfaces, but uneaten food can still decompose and affect water quality.
For your own tank
Check the tank the next morning and remove food that has softened, clouded the water, or gathered debris. Different formulas break down at different rates. A smaller portion is a safer experiment than leaving a large serving and hoping the colony cleans it up.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.