A few days ago, I noticed a few intense red spots on the live rock, pretty but unusual. I couldn't figure out what they were. They never seemed to move. I haven't added anything new to the tank in a few months. I finally saw one move today. I guess they are the dreaded red flatworms (planaria). I don't have many but, since I feed the corals well, I assume they will continue to multiply. I've read that Flatworm Exit is safe to use but am scared to try it. What chemical is in it (the web sites don't say)? I have snails, crabs, two fish, feather dusters, and so on. Should I just wait and see what happens or risk treating the tank now before there are a lot of them? It's a 12 gallon nano cube. If I look hard, I can only find about half a dozen at any one time at this point. Thanks.