Bidadari,
Thank you for your inquiry into the diet of the Siganus Punctatus in our Diver’s Den. Rabbitfish are known to eat bubble algae and they are generally reef-safe if kept well fed. The Emerald Mithrax Crab may also eat some of the smaller ones. Other options are removing the bubbles manually, being very careful not to break them and reducing the amount of nutrients in the water. Regarding the Rabbitfish in our Diver’s Den selection, since the Rabbitfish is not housed in a tank with Bubble Algae we would not be able to guarantee that it would eat it in you aquarium.
Gwen S.
LiveAquaria
Drs. Foster and Smith