Welcome to the club!
Kinda sux, you JUST missed out on the Drs Foster and Smith group buy that included refractometers. But I checked their website and they are on sale. Here's the link:
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=9957&Ntt=refractometer&Ntk=All&Ntx=mode+matchallpartial&Np=1&pc=1&N=0&Nty=1">http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=9957&Ntt=refractometer&Ntk=All&Ntx=mode+matchallpartial&Np=1&pc=1&N=0&Nty=1</a>
As for the Mag pumps, I can't help you out there, but hopefully someone else will be able to chime in and give you some info.
Congrats on joining and enjoy the discount and the good people and knowledge.