I'm in the process of setting up a 40 gallon mini reef, and some of the live rock I've purchased has bristle worms and an aptasia anemone, which I know spread quickly. Is there any way to get rid of them? My LFS told me to get a peppermint shrimp for the aptasia anemone and an arrow crab for the bristle worms, but they're not helping. Any tips would be appreciated.