I have usually had luck with white vinegar. As long as I can actually inject the center of the anemone, it works. (The hot pepper stuff definitely does not work...). 2 problems with injecting: 1, the syringe can pass through the anemone entirely. so that nothing gets injected into it, and 2, the anemone may actually be anchored very deeply inside really porous rock. There is no way to effectively inject these guys, as they easily pull 1-2" inside. In those cases, I have found the only thing to do is discard the rock entirely. Take care, Eric