Yes we

[YES]

UV or no UV ?

 

[Brad Miller]

No for me
Never saw any real benefit to using one

 

[Ranjib]

Depends on your setup. It can help removing bacteria . Not very useful otherwise

 

[oldpaddy]

No. I firmly believe they're a waste of money. I worked on marine tanks for a couple of years and I've had one my self for a long time. I never saw a difference in tanks that used them. I have never had one in my systems.