An interesting suggestion, and you could be correct but Dasycladus vermicularis usually has broader 'strands' in relation to their length (these are really long and slender) and a less solid looking structure, so it is hard to be sure. You seem fairly sure Bongo Shrimp, and I'd be really interested to know what your reasons are (so that I can update and refresh my knowledge base).
I can see why the other two suggestions were made. Caulerpa racemosa (grape caulerpa) is a pretty variable species and does typically have 'strands' which grow from the base, but even the most linear variants of it usually have a much more distinctly 'knobbly' appearance.
Codium species usually have branching 'strands'. However, as the University of Hawaii Key to Chlorophyta puts it, 'Plants not paddle-like, but with many different forms; surfaces velvety, sometimes bead- like; usually dark green, always producing pinkish liquid when standing in fresh water' (my emphasis), but the repeated pattern does look more like the kind of 'whorls' seen in Dasycladus than bead-like...
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