Who eats valonia?

[Delphinus]

What else do mythrax/emeralds eat besides valonia?

What about caulerpas, and sargassums type macros? I have some neat sargassums starting to form and I don't want those to be mowed down. Would they be at risk?

I guess I'm going to try one of these (Big Al's in town has them in right now), and just keep a close eye on him. If he starts eating stuff or harrassing anyone, I guess he can go into one of my other tanks... I have some valonia on a rock and thought I might try and let an emerald go for it, and save myself the effort of tweezering off about a few hundred little bubble algaes..