UV sterilizer?

[hockey nut]

The reason I ask is because I have one ( bought some time ago) and I am currently trying to finish building my setup for my new 120. I'm looking at what space I have and where in my setup to put/place it if I was to use the UV unit. It is one of those 9wt turbo twist units. I have my calcium reactor/ 2 x mak 4/ 940wt total lights/ sump and refugium under construction etc, bullet 2 skimmer etc etc. Still building canopy and reflector. Getting there, but still a ways to go yet.

Sorry to ramble on . My question is do I need the uv unit. Are they benificial? Where in my setup would I place it ( sump )? Should it run 24/7 or only 1 day a week? Your thoughts are appreciated.

Anyhow thanks for all your help.

Happy New Years to all. And Happy Reefing