i read that ppl mention that if you feed your green open brain they grow quite fast but im not 100% sure what would be the mouth..
sorry for the crappy pic but from my understanding it would be the little green spot towards the middle of the brain
Yeah, it's hard to tell what's what in that photo, but the mouth, or mouths, will be little openings near the center of the coral. If you put some mysis shrimp on the coral, it will open up.