No luck with my notes, but from memory, some thought it was a sponge, but as I recall there are no openings and it felt like cheap plastic in your hands. This stuff gets big, I remember pulling it off of live rock and it was larger than my palm, almost covered my entire hand. It develops into large wavy, crinkle-like formations, mostly flat, but with some raised areas. I don’t remember if any fish ate it or not, but I think we just pulled it off and threw it away when we sold the live rock it was attached to. Think of it as a 3 dimensional brown ulva. I’m pretty sure it was found on both Fiji and Marshall Island rock. But I’ll keep searching for a species name. I thought it could’ve been a valonia species, but I don’t think that’s right?
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