I have a 125g reef tank primarly devoted to sun corals, gorgonians and small fish.
Unfortunately I also have caulerpa in the tank. I hate it. I pull a large amount of it out every week.
A long spine urchin does nothing for it (or against).
The only other suggestions I was given was:
  • tang
  • rabbitfish
  • sea hare

I got a tang and it didn't eat the caulerpa. It also was very hyper and scared my clownfish into the overflow several times! It was a total PITA to catch that tang and get it back out of the tank. Took a whole day.

I like the sea hare idea but everything I read seems to imply they eat hair algae. I don't have hair algae. I have bubble and caulerpa. A caulerpa eating sea slug would be my preference. But no point in adding one if I don't have food.

So I am considering the rabbitfish.
Will it be hyper like that tang?
Will it threated the clowns with it's spines like the tang did with its scalpel?
Will it hurt corals, shrimp, clams, etc.?
Will it eat caulerpa?
If they all differ I think the Fiji Bicolor looks nice but I'm open to suggestions.