1 more tang...too many fish?

[Son Of Skyline]

Just a bit more clarification. In my attempts to curb this macro problem, my tank also has an emerald crab, sally lightfoot crab, and a tuxedo urchin. None of them even touch the macro (grape caulerpa).

A better question may be....what else can I get to try to eat this stuff if another naso is too much?

I'm in the process of trying to eliminate the nutrients in my tank but it seems this caulerpa problem has haunted me since day 1 of my first reef tank about a year and a half ago.

Thanks again.