I just set up a 55 gal reef tank that's currently being filtered by 2 HOB filters. I will be switching to a sump at some point down the road. In doing my research on sumps and refuguims it seem that for a refuguim to be effective it needs to be really big. The owner of my local FS said to have a barely large enough refuguim for my tank I would need a sump of at least 50 gals and bigger would be better. What do you guys think?