Has anyone found anything to eat caulerpa (excluding fish that is)

[Delphinus]

Fighting a losing battle in my carpet tank with caulerpa. Manual removal is the only thing I've got going but it's not really good enough because it breaks too easy.

Tank is way too small for a tang or a rabbit (which I've had luck with before for eating the stuff). Was wondering if there's an urchin or something I could consider putting in there to help with the fight...