My brother and I are going to start spear fishing soon. We've recently started free diving and love it. Id like to start getting some sprearing gear and I have a question. I've read a lot about different set ups and for some reason Im having trouble finding out weather or not to anchor the SMB, and if so, how do you anchor it? I want to make sure I do things the most logical way. I have not purchsed one yet so any suggestions would be nice as far as the best non expensive set up (although this is not my main question) Also..is this something that my brother and I can share, or is it recomended that we each have our own SMB?