when starting a tank

You generally won't need the UV until the tank is fully cycled and you are ready to add fish.
 
when trying to keep high end angel fish which piece of equiptment is most important a ro di unit or a uv sterilizer

emperor, blueface, queen, etc.
 
While I would agree RODI, I would make this argument, you can buy RODI water, but you can't buy constant uv sterilization! Still I stopped using my UV when the bulb burnt out and have been loving my RODI at home.
 
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