aptasiaX or get a syringe and suck the offending item into the chamber that way when it barfs out its contents you will catch them in the syringe. If your careful you can cover the mouth of the anemone with the aptasiaX and it will keep it from spitting its contents all over your tank. I use the syringe method as I have a fairly large syringe and suck the pests out of my tank. It works especially well when I have too many close neighbors I dont want to harm with aptasiaX...I have ruined a really nice frag cluster due to aptasiaX wandering around too much. Let me know if you need any more info.
Zaphod