Pom Pom Algae

Found in thick clumps in rocky crevices over shallow moderate surge zones of slopes and terraces on coral and rocky reef tops. Looks like a green sponge, but has no pores.

As many as 9000 species of algae are spread across the worlds oceans, some can be as much as 30 metres across while others are just a slippery scum over rocks.
Algae grows wherever there is enough light and life supporting conditions.
They support a huge number of marine life both for food and as a home.