what marine plant is this?

Caulerpa taxifolia. It's a good MACRO ALGAE, a fast grower, but be cautious because it is prone to going sexual.
 
they are not to have, I think it illegal because it bad for the environment if accidentally get release into the drain
 
They're only illegal in some states.
But, yes, if you need to get rid of some then double-bag it and throw it away dry. That stuff's crazy invasive.
 
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