I have a new female betta introduced a few days ago to a six-gallon tank with three Habrosus (pygmie) Cory Cats. I know Bettas can often but not always be successfully kept with Corys and so far, so good peace-wise. However, I'm wondering how others have successfully fed them when kept together.
I'm happy to see the Betta's appetite is so good and loves any kind of food I've offered so far: Bloodworms, Atison's Betta Pro, Hikari Betta Bio-Gold, thawed frozen pea. BUT she also goes for the Corys' shrimp pellets! She usually gets there before the Corys, grabs the pellet and swims around with it in her mouth looking like a Chihuahua running around with a German Shepherd's rawhide chewy. The sight would be funny

were it not for the possible serious implications. I think she's getting too much food and the Corys aren't getting enough.
An improvising friend witnessing Her Piggliness suggested dropping the shrimp pellet through a straw to the bottom of the tank while distracting her with her main dinner. The straw idea worked great -- the shrimp pellet dropped through it immediately to the bottom of the tank, so she didn't see it going down and get all excited about the chase. I left the bottom of the straw in the substrate with concealed pellet, tank lights on, while she was eating her dinner. Before removing the straw to expose the pellet, I turned off the tank lights. But she got to the pellet before the Corys even had time for an appetizer!
Would it perhaps work to try this by feeding her dinner, then removing the straw with concealed pellet to feed the Corys a couple of hours after tank lights are off? I'm figuring the Betta girl might be asleep, the pellet would be somewhat dissolved and not such an enticement, and the Corys could eat since they're supposedly more nocturnal than Bettas.