Just got the frag today in the mail. You really out did yourself with the packaging! It arrived in perfect condition and although I'm pretty sure it has already fastened to the rock I'm going to leave the netting over it for a bit longer.
I'm actually kind of hoping its S. complanata! That way I wouldn't be disrupting the Florida biotope theme, since this species has been recorded here.
This is what Littler et al. has to say about S. complanata in "Marine Plants of the Caribbean":
"Plants are quite distinctive, translucent, pale red, and usually 5-8 cm tall. Branching is strictly dichotomous. Regularly cylinderical branches with a soft gelatinous texture are all approximately the same length, creating a bushy, hemispherical plant. This alga grows at moderate depths (2-10 m) on coral fragments."