I don't know if their metabolism is any different than any other fish's.
Chromis viridis, Blue green damselfish: aquarium says they are plankton feeders. I think that most all fish are constantly searching for food. On the reef they are never sure where their next meal will come from and have to get it while the getting is good. I do know that sometimes the
LFS is not all the knowledgeable. I have a single chromis that came with my nano. I feed every day and sometimes every other day and he looks nice and fat. He loves Cyclopeze and I guess this goes along with bring a planktivore.
