lettuce calerpa??

blaze, I didn't know what kind of caulerpa you were talking about before (thought maybe you were talking about sea lettuce, Ulva), but it turns out it is another common name for feather caulerpa. A lot of animals eat this... tangs will clean it up, but they aren't appropriate unless you have a large enough tank to accomodate them. Did you try removing any by hand? It doesn't grow as fast as grape caulerpa, and a little can be attractive.
 
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