OK, if you are serious about this than i would look at the
Emperor site and look at thier sterilizers. they are very good and have correct ratings on their sterilizers for both protozoan killing and algae killing.
to do this right, it will cost a pretty penny. you will notice that these sterilizers have very large inlet and outlet ports on them. this is to keep the back pressure through the sterilizer to a minimum so they can be run inline with the skimmer.
if you
skimmer pump is the OceanRunner 3700, than i would be looking at a
flow rate of around 400gph. i would look at a sterilizer that can kill protozoans at a minimum 400gph flow rate. to be even better you could get a sterilizer that is rated to the full 900gph of the Oceanrunner 3700. that way you have some room to expand later.
G~