Hang on the tank UV

[ryddo]

I am looking for a good hang on the tank UV for a 40 gallon closed loop system. Does anyone know of any good UV sterilizers that are feed from a pump inside the tank and returns back into the tank. I have been looking at this unit http://aquarium-supply.biz/ordering/...CUSAGamma.html does anyone know anything about it?

Thanks,
Ryan

[Steven Pro]

For UV's, I prefer Emperor Aquatics brand.