20 gallon tank,25Lbs live rock,emp.400.Just wanting info on what skimmer to get once I start adding corals to this system. Was recomended a corallife super skimmer(65 GALLONS) by LFS.would this be to much skimmer and if I added it would I still need emp.400 since I have 25 Lbs live rock plus more once I start adding coral which would act as biological filter? Thanks for your input !