Blooming Sea

From BoardGameGeek:

Blooming Sea is a colourful tile-laying game by Reiner Knizia, where players take on the role of environmentalists working to restore vibrant coral reefs. On their turn, players place tiles containing clusters of corals, aiming to build or expand reefs of matching colours. They score points by creating larger reefs and by surrounding fish tokens with corals of their colour. -description from the publisher