Green Hairy Mushroom (Rhodactis)
A variant of Mushroom coral (Discosoma sp.)

Representative Mushroom coralphoto — a dedicated image of this exact morph isn't available yet.
A *Rhodactis* mushroom covered in short tentacle-like 'hairs', usually green; fast-spreading and very hardy.
Keeper tips for this variant
Hairy mushrooms can sting and overgrow neighbors — give them their own rock, as they spread aggressively into a mat.
Other Soft Corals variants
Blue/electric blue mushroomWatermelonBlue MushroomWatermelon MushroomBounce Mushroom (Rhodactis)Jawbreaker Mushroom (Rhodactis)JF Bounce MushroomSunkist Bounce MushroomRainbow Bounce MushroomJawbreaker MushroomSunkist Mushroom (non-bounce)Superman MushroomWWC Orange Flame DiscoWWC King Tut DiscoWWC Red Jaguar DiscoTrippin Iguana DiscoSuperman DiscosomaRed Alert DiscosomaBlood Red DiscosomaFruity Pebble Discosoma