Red Coins in the Coral Reef
From the Super Mario Wiki, the Mario encyclopedia
Eight Red Coins are scattered around Gelato Beach's coral reef, which is located behind the Surf Cabana on the opposite side of the beach from where the player starts. Six of the Red Coins are placed within the reef itself, whereas the other two are grouped with a school of red fish. If the school scatters into a rock or the ground, the Red Coin will disappear with them, though the group will return elsewhere after a few seconds. Collecting all eight of the Red Coins will have the Shine Sprite appear over one of the reef's rocks.
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