If possible I would buy the aiptasia x because it can be back in the future from more rock of even corals. Very handy to have in your arsenal! I seen it ob Amazon for $10. If you just want to remove the rock soak it in scalding hot ro water (no guarantees) and maybe even add vinegar. In those conditions it will die over time and so will everything else living in the rock itself. This stuff can just about survive a nuclear war! I've also heard that it can spit out a bunch of pore like babies that spreads throughout your tank. Goodluck and let us know how your first battle goes. Just wait till the cyano battle breaks out!!! Lol