This sprung up in my old temperate build several months ago out of nowhere (likely from a spore). It has grown slowly, yet steadily ever since. I would assume it hitchhiked on some North-Pacific seaweed.
A few weeks ago I accidentally brought home a sargassum crab Portunus sayi, with some water from the beach. I had one before, so I knew he needed his own tank. They eat everything. He's in a bucket for now, with a little HOB filter. I got him some sargassum, which slowly died, and he ate it. I...