I have always had a hard time keeping aquarium plants alive, but I think I'm going to give it a go, and start with something really easy, like a couple marimo balls. But I have read horror stories on this site about all of the nasty little creatures that aquarium plants can introduce to a tank. I definitely don't want to be overrun with snails or any other little hitchhikers, so is there anything I can do to prevent it? A long time ago, I read something about soaking them in diluted bleach (and of course rinsing well before adding to the tank). Would this be safe? If so, what bleach-to-water ratio should I use? If not, is there anything else I can do?