I think I got some really health looking shrimp! The size is about what you would find in a pet store, but usually in a pet store it's twice the price! One of them even had eggs. It was well packaged and the shrimp got to work as soon as they got into my aquarium. If I put my hand into the aquarium they will try to clean it. They eat a lot, so if you overfeed, I think they will find and eat most of the food your fish leave behind.