I am looking to add some SPS to my 55 Gal that has been set up for 18 months. I am upgrading my lights but was concerned with my current flow I have 2 Hydor Koralia 1 (400 G/hr each) and a rio 2500 return from my sump (600 G/hr adjusted for hight from sump) that gives me a total of 400 X 2 =...