I prefer the Triton Method for my sump, water comes into the Fuge from the tank, no Filters or socks, then to the skimmer/media chamber, then return pump. Very simple but extremely effective setup.
Unlike traditional refugium designs, the TRITON sump features an innovative layout with the algae bed positioned before the skimmer. This allows the algae to effectively filter the water before it flows into the skimmer chamber, where unwanted proteins are removed. The design includes a protein trap in the second chamber, allowing proteins to accumulate until the skimmer can efficiently filter them out, enhancing overall performance.
The Algae Refugium Provides the ideal conditions to grow a variety of algae types and provides a refuge for a range of biological life (eg. isopods, amphipods, copepods, etc) that produce plankton to help feed the coral growing in the display aquarium.
Skimmer An essential element for gas exchange and the export of biological waste, the skimmer prevents waste from breaking down in your aquarium, ensuring a cleaner and healthier environment for your corals.
Above copied from Triton. Here is a link to this info,
https://www.triton.de/fileadmin/use... - Document - TRITON Method - Full Manual.pdf