octopus bubble coral?

[SeaHorse_Fanatic]

The Octospawn coral looks like a Frogspawn, except it's not branching, it's hard skeleton grows in a round disc, like a plate coral. These corals are usually more translucent than frogspawns, torchs or hammers & when fully inflated, they can look like long balloons with pink or green spots on them. Much less common though & more expensive.

Anthony