I agree with WV Fish Guy a quarantine tank is necessary. I would not put any live rock or sand in it though because a quarantine tank does not need to be kept all the time unless you are introducing new fish frequently. Also if you use copper-based medications in the tank you will not want to put the live rock in any reef tanks.
However, I do not believe in UV sterilizers. I used one for a couple years did not see any real use for it so I got rid of it. I believe they might be a minimally useful in controling nuisance algaes but besides this I think they are a waste of money. I know everyone is now collecting stones to throw at me but that is ok because I am in my backyard vintage 1952 nuclear fall out shelter and not afraid of any of you UV disciples.
Before the stones start to fly let me explain why I do not use them.
1. They kill almost any microscopic critters that flow through their light. This means bad plus good. And you guys wonder why your tanks lack mini-stars, copeopods, and mysis.
2. I can control nuisance algaes in a more natural way. Use clean water, do not over feed, use macros to deprive nuisance algaes of nutrition.
And a little on the technological side keep my pH up and skim the tank -bam not much algae.
3. I have never seen a UV sterilizer alone be able to rid a tank of ick or other parasites once they have been severely introduced. Which is the way it happens, somebody who does not have a QT dumps an unacclimated fish into a tank and then they can watch the opening series of Stephen King's "The Stand" happen right before their eyes.
4. One last thing how many of you go to the tanning salon when you have an illness? Or do you have it treated with proper medications?
Therefore the answer is not a sterilizer but consciencious husbandry by the hobbyist. Which in Hillbilly means- One bad apple can spoil the whole bunch or one rotten potato can make your whole house stink. Do not put a sick animal in your display tank.... And if you buy one that turns out to be sick keep it in a QT so the rest of your livestock does'nt get sick and you can treat the ill animal.
Now have some fun trying to persuade me into your UV cult
