Checker board wrass ate my hermits

[boots]

Hi everyone
i have had a checker board wrass for about three months now and decided to add some blue knuckle hermits .the problem is that i could only find some that were a little on the small side.and when i added them my wrass picked one up hit it against the tank and them spit it out and off to the next and them the next . Is if eating them . Do i need to buy larger ones .is this even normal.