Well, I figure since I run carbon passively, try to use my sump as a settling area, and really, there ain't a hope in hell of creating the flow I need from my return pump, going slow was better. Also, I read it on the Internet, so it must be true.
I remember running a MAG 12 as my return on my 75 wide open, returning to two nozzles. The flow was nothing at all. To rely only on one return pump to generate enough current, you'd need a 3 or 4 inch bulkhead, at least for my purposes.
Therefore, slow sump flow means greater contact time with filtration media, greater settling of detritus and less micro bubbles returning t the tank. Also much quieter going down the overflow.
As with everything, YMMV, and if running 3000gph through a sump works, you'll enjoy not having the tank cluttered with powerheads.
Of course 1 small stream in the back corner would be more than enough for a 58......
