Some tangs will eat Caulerpa and most Foxface Rabbitfish will, but obviously your tank is way too small for a tang or Foxface. Some seahares will eat Caulerpa. Blennies won't usually touch Caulerpa, and I've never come across any snails, shrimp, or crabs that will eat it.
You're better off picking it out as best you can once a week and work on lowering nutrients. You should be able to eradicate it in a couple months.
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~ Mindy
SPS fanatic.
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