I think the research suggests maintaining minimal flow through a fuge is beneficial but I have high flow through mine (I have a 3 section sump... Skimmer, fuge, return with only a single drain, flow through to a return. The last section has a bubble trap. It also houses Ato switches, two heaters, a two part dosing system, a pH meter, a carbon/GFO
reactor, and a couple other pieces of equipment. It maintains 0 nitrates and phosphates.