I have 2 Platygyra sinuosa Maze Brain Corals. Their feeding tentacles come out at night. I occasionally target feed them with Liquid Life Marine Plankton(Frozen Cyclops-eze) and some DT's Frozen Oyster eggs in the morning before the lights come on and their tentacles are still out. From what I have read, since the tentacles come out at night, it is indicative that they are zooplankton feeders as opposed to phytoplankton feeders. One of them is shaped exactly like a human brain which I think is really cool. My wife thinks they are boring, but she thinks most of my corals are. She really hates my large Bubble Coral and calls it "Cajones" because of the oval shape of the bubbles.