They sink right to the bottom and the Corydoras come swimming and the shrimp come running. The shrimp will even try to to pick them up and drag them to their cave. They all seem to be doing well from eating them.
Fluval Bug Bites Bottom Feeder 4.6oz
Bug bites were recommended to me to get my bottom feeders eating and keeping a robust weight. & it has worked wonderfully! They feed this in their store as well so the fish readily except it.