I have always bought these sinking wafers for my cory cats. They have always jumped right on them as soon as they hit the sand. They're definitely a cory favorite. I always make sure to keep plenty of these wafers as a staple in their food pantry. Additionally, iHikari foods period are a favorite of mine as well! A nutritious and high quality brand I trust. Hikari is known for making species specific foods and that matters!