I've had good luck with racoon butterflies. If you're able to manually inject them with dilute muriatic acid, that would work as well but watch your pH in a smaller tank. If its a larger tank with many anemones, the racoon would be the way to go.
It also helps to keep the new racoon in a separate tank, then introduce some small rock with the anemones on it, and train them to eat them. I've done that to the point where the racoon would start to dance as I approached the tank with a new rock.
Joe