Blue Bubble Coral
A variant of Bubble coral (Plerogyra sinuosa)

Photo: Oceanamazon · CC0
Representative Bubble coral image. A confirmed image of this exact morph isn't available yet.
A pale blue form of bubble coral, usually sold as Plerogyra simplex. It needs stronger light than other bubble corals to stay bright.
Other LPS Corals variants
White/Cream bubbleGreen bubbleGold / Yellow bubbleBranching / Wall bubble (Plerogyra simplex)Rainbow / Metallic bubblePearl Bubble Coral (White Plerogyra)Green Bubble CoralPearl / White Bubble CoralOcto-Bubble CoralBranching / Grape Bubble Coral (Plerogyra simplex)Aquacultured Marshall Island (MIMF) Bubble CoralBiota Cultured Pearl Bubble CoralMetallic Green Bubble Coral