Help! Amano Shrimp + Panda Corys!!!!?

ok so i hvae 4 amano shrimp that always ate leftover food thta my fish didnt eat i would see them in the morning come out to eat the leftovers. now ever since i added 3 panda corys they hog all the leftover food even if the night b4 i fed the corys pellets and i rarely see the shrimp only once in a while...are they dead did they starve...do amano burrow...please help me???