technically ANY macro/coral/creatures you take out of your tank is 'good' for exporting.
I just recently found one small mystery-sprout of something similar, but brown and spikier - almost cactus-like. I'll let it grow out considerably before I try pruning it back considerably.
That loooks like Caulerpa serrulata. I would try to keep bunches smaller than a baseball or it might go sexual (breakdown releasing toxins and gametes into your tank, polluting the water).
it looks much like a Polycavernosa, but i've only seen one and it was red. see what you can find. do you think they look similar to the one i attached?
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