Its just stupid because people always argue this. I will say this you will introduce ick into your aquarium at some point in your tanks life. What I was trying to say is I believe in a tank I believe all fish will get ick at some point. I'm talking about one cyst or more not a outbreak. Wild is a different story with water volume. Mchartier posted has great info on ick, but look at #8. I mean really, who the hell qt's sand. U take a shot at someone and basically call them a dumbass and then say not trying to be a jerk. My puffer is over 15 years old and had a bad outbreak of ick and managed it with a UV. If you ask me that is successful, but u can get the last world because I don't have the time nor patience to come on here and debate a topic that has successfully worked for me every single time I battled it. For me it worked and for many others as well as long as you have the right wattage and water flow, but it will never fail in this hobby that you will always get people that say don't waste your money it doesn't do anything.