Defended Sea Rupee
With the rise of organisms meant to harm crystal flora, inevitably they started to take a hit. The Defended Sea Rupee rose up, replacing the sea rupee in its environment by developing a sort of resistance. When any living organism enters it, it responds by producing a protein that essentially shreds the threat from the inside-out, killing it and allowing it to digest it like it would anything else. It avoids shredding its own organelles using mineral markers, which have a unique shape depending on the individual and the available minerals. It is otherwise identical to its ancestor; it covers the seafloor like a sharp crystalline grass, it has a fungal core, and it reproduces sexually using water-borne spores.