Aquarium information or lack of (UV Sterilizer)

Aquarium information or lack of.

I was going thru Yahoo Answers, as I was curious about this feature.
I stumbled upon this gem;

Question:
What is the best UV Sterilizer for use in a 20 gallon tank and where can I order one online?

Answer:
A UV sterilizer might do more harm than good to a 20 gallon tank. The UV sterilizer will do exactly that; sterilize almost everything that passes through it, bad bacteria and the good. In a 20 gallon tank your water will circulate so many times that you may be doing more harm than good. There are other ways of treating the water in your tank that might not be has extreme as a UV sterilizer.

TOTALLY AND COMPLETELY WRONG!

This a good example where caution needs to exercised not just on the internet, but at many so-called aquarium stores staffed by un-knowledgeable aquarists.
Often many aquatic forums are staffed by after work aquarium “experts” who have not done their homework or worse, they are just plain dishonest.
I have spent 25 years studying, reading, and doing tank by tank comparisons in my aquarium maintenance business. A UV should be properly installed such as not to high or slow a flow rate. Also the watts per gallon have to be figured.
Another often missed aspect is the Redox Potential which research shows having a proper Redox Potential around 300 mV improves the water quality much the same a way an anti-oxidant vitamin works. A UV sterilizer properly installed helps with this!
Also in studies with goldfish (a very dirty fish), I have found vastly healthier fish in aquariums with UVs vs. without, all other aspects such as feeding and filtration equal.
Here is a full article about this subject: Aquarium UV Sterilization and how UV sterilizers work

When I read this answer, it makes me wonder about subjects I am trying to learn, but still have a ways to go such SEO. I have asked questions (such as SEO) from others trusting their advice, only to get many different answers. Anyone here can pose as an expert and not know what they are talking about either and someone such as myself who is eager to learn, but relatively un-knowledgeable can get taken.

This goes with other strange "answers" found a YA, including several gems about aquarium repair, which left me scratching my head why anyone would ask when there is excellent aquarium repair information available on the internet such as this article: Aquarium Silicone Repair