It's not that they need it, it's like a supplement. I have and open brain that I got from a LFS. The guy sold it to me for $25 because it didn't look healthy. I was feeding squid to other corals in the tank as well as the ricordia, the brain took all I could give it. When I stopped feeding it, it still doubled in size. I think they do well if you feed them but they can do fine living off their "zooanthellae" the symbiotic algae living within the coral. These algae feed the coral during their photosynthetic process.
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