I am new to this hobby and going to start up a 125g dual overflow tank. I am going to build my own sump and had watched a video with someone who had made a sump with horizontal flow instead of vertical flow with a refugium as a part of it as well. I had liked the design but can’t find any information on this and doesn't seem anyone else is using this method. Does anyone know the cons and pros of this type of sump? They had mentioned in the video that it was more of a natural flow. My question would be is if you had any knowledge on this and would it be worth the build? Thank you in advanced.