I was thinking when I decide on a sump is PVC piping good choose can't I buy a sump already made for a refugium or Berlin system what the difference with algae scrubber and mud method i know algae Scrubber helps with nitrate and phosphate I see ecostystem www.ecosystemaquarium.com Michael palletta uses it he's a reef aquarist I also have his book the new marine aquarium created of filter is Lang sy what I understand so far that system less maintenance and water changes I'm still stuck on filter system can't decide what sump I want to do wet/ dry system you need to clean often I hear why is it hard to decide