My lobster generally eats whatever floats past his hiding spot. He generally never comes out of this little crevice he has wedged himself into but on occassion, I'll see a claw quickly come out and grab some food. I feed mostly the frozen meaty foods (shrimp, cyclopees, etc) and on occasion I have thrown some flakes in. He seems to like the flakes, but I think it may have more to do with the flakes being slower as they float by.