hey it is not the pump fault, instead it yours... nowing that anemone move ard alot, you should have do something to prevent the anemone from entering the pump such as cover the base of pump with a layer of netting..........
If you guys want to keep anemone, be prepare to provide alot for it such as strong lighting like MH, and regular feeding for it............ Pls dun kill life unecessarily.........