The species was identified by John Maloney but when I look it up it doesn't have the 3 branching leaf like Caulerpa Prolifera... I got it from a friend a couple of years ago... Nope, not locally collected..
Nice pics there! The seagrass is growing very well under compact flourescent light. And you're right! It spreads like wildfire! :biglaugh::biglaugh::biglaugh: