There are many different species of caulerpa and even the same species of caulerpa can have many different forms. To me it looks like you have razor caulerpa. Yes it can be cool stuff, it is awesome habitat for microfauna. But it has a trade-off in that it: 1) tends to grow very quickly and if you have other things they can be choked out by it (like any kind of weed to non-weed relationship) and 2) it can sporulate or "go sexual" which is a sort of algae explosion which makes your tank cloudy and smelly for a day or two. So it does need to be pruned regularly if you intend to keep it.
If it's plant-like and in seawater, then it's either: algae, macro-algae (ie. seaweed), or one of a very few select species of saltwater tolerant plants. (There aren't many, seagrass/eelgrass/turtle-grass and mangrove trees come to mind).
Steve/StirCrazy: I didn't think they were called rhizomes. .. ?? To me a "rhizome" is a rootstalk ... a stem from which the plant stalks and roots come out of. I was referring to just the the holdfast part. There is a (what I thought was the) rhizome which is the tube-like stalk from which these tendrils come out of, as well as the leaf node things.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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