Does anyone have an idea what this green macroalgae is? I obtained it a month ago on some LFS live rock (which I assume originated from the Indo-Pacific when wild live rock was more popular). Since then, it has doubled in size, having grown to an inch across. It is smooth, and stiff yet is very flexible as well. My guesses are that it might be a green Gracilaria tikvahiae individual or Cladophora, but it might be neither as well.