I only run a UV filter on one tank because it turned into an opaque phytoplankton tank one day and water changes wouldn’t make it go away. The uv filter cleared it up. Looking back, I should have just kept it that way. That’s hard to achieve when you actually want it for say a shrimp larvae rearing tank or fry tank.Huh? No they aren't...
Yea seems like over kill. Everything has a purpose, but need to match goals of the tank with what you are applying for filtration. I wouldn't use UV ever, but for running all that I'd expect it to be for some darn heavy feedings.