Good Day !!
My Blue Tang ate my tank grown Caulerpa whenever I put some on the main tank to feed him in absence of Nori, I guess its possible to put one juvenile blue tang I]try to borrow one from fellow reefers in your area[/I] in your main tank until such time all the Caulerpa has gone (eaten) then you can return him.
Anyways foxface's do eat Caulerpa also, your choice !!!!
:rollface: