I have a 125 gallon 6' long tank with an eshopps rs300 sump and a psk 150 protein skimmer. I want to add a better Protein skimmer and a refugium. What is the best way to go about this. I have 25" in height for a skimmer. Also my sumps first chamber has a 16 x 14 open footprint and the second chamber has a 10 x 14 footprint. Not sure if i should get an in sump protein skimmer or an external skimmer. Any info is greatly appreciated.