Well it has been 2 months since I qt'd my fish and used New Life Spectrum Ick Shield powder. I followed the powders instructions and both the wrasse and a sailfin tang that were covered in ick are healthy and doing well. Both of the clowns died the second day in the qt. I would say the powder works and is easy to use. I have left my display fallow the entire time and will wait another 2 weeks before adding fish back to the display. Lol and from now on I will qt all new fish and I am planning on setting up another qt for corals/inverts.