What does my marine Betta eat?

[fadecase]

Okay so I have had this marine Betta for over 3 years , she's grown alot and always plump and fat. But what the hell does she eat?! I never seen her eat ever . I have jumbo krill that lays beside her and she doesn't go for it.
She's stunning and always trying to scare me off when I see here acting like she's a Moray eel lol.
Just wondering what would you guys think she might be eating thanks

[sparkeysplace]

I