i'm not yet sure if i'm going to kill them, they're all on one rock so they can easily be removed. i've heard many people purposely put these in their tank because they're so beautiful. but my tank isn't big enough for something like that i think. they multiply and it probably wouldn't be bad if i had a huge tank... who knows though i might keep them. they are REALLY nice looking, and my girlfriend loves them. the one thing i've read after researching them, which i see them called "tulip anemones" on wetwebmedia, who also say that if you have pristine water condition they should be no problem whatsoever, is that they aren't anywhere near as much of a pest as majanos.