I've been wondering about the long, slender bits at the top and bottom of Eddy's tail fin and whether they have a purpose. I thought that not all Angels had them and assumed that Colin didn't because I thought his tail had fully recovered from fin rot. Apparently he still had some healing to do and I'm starting to see little spikes growing on his tail! I've also noticed them on his anal fin. I'm so excited to find out what he looks like in his full glory;D So...do those little spikes have a purpose? Or is it just decorative?