Yeah, general key to LR
filtration is 1-2lbs of LR
per gallon of tank space (many find 1.5lbs to be a good balance on filtration and aesthetics), and plenty of circulation...a very minimum of 10 times per hour turnover. For example, my 40gallon breeder uses 2 Maxijet 1200's, which are a 295gph turnover. 295x2=590 divide by 40 = 14.75 turnover per hour.
Add to this that I have a skimmer for a little flow, and a hang-on fuge for a tiny bit of flow, and that I sometimes run an AquaClear Mini HOB
just to help remove surface scum, and it's just right.
Count powerheads and pumps, but not the skimmer because it just doesn't move much water.
20 x per hour isn't uncommon either.
As for UGF
's...they do have their place in very specific setups...but generally speaking, they are out-dated in the SW