OK so I want to add a sump to my setup, I already have a refugium, it was a all in one setup with a protien skimmer built in, I don't think the skimmer is working right, so what I want to do is have my overflow go into the sumo with a new skimmer, go through what ever should be in the sump to help clean the water then pump through a phos reactor then go into the fuge and then back up to the tank, what would be the best way to plumb the setup, and what should be put in the sump for a filter media? Oh yeah I have a 125gal single overflow.