Sheley and others prescribe meaty diets based on daily offerings of brine shrimp, plankton, commercial and homemade formulated foods. I have found these animals to be undemanding in their food preferences, eating all types of prepared, fresh, and frozen fare.
Keep it well fed or it might eat your other shrimps or fish )
Boxers can be "problematic" with other inverts and fish in the tank especially if the tank is small.