This is a Corallimorph, which is a group resembling a large and fleshy stony coral but with no calcareous skeleton.

Ricordia florida has soft discs which crowd together forming undulating sheets, extending low over the rock, and covered with stubby protruberances.

It comes in a variety of colours, and is greatly favoured for growing in aquaria, and this industry has developed many differently coloured varieties. There appears to be only one species in the Caribbean (and others in the Indo-Pacific).