Ok, if it's Velvet then you can do the things I mentioned in a previous post. 100% daily water changes, raise the temperature if you can to about 82 (two degrees a day only), and keep the tank somewhere dark (you can just put a towel over it if you want, that's what I always did). DarkMoon17 has a sticky on diseases and treatments, and recommended the following medications for Velvet (since aquarium salt won't work in this case): "Jungle’s Parasite Clear, API Super Ick Cure, or Kordon Rid Ich Plus".
As for water conditioner, a lot of people use Prime, and I use the Top Fin brand.
Here is the link to the Disease and Treatment thread I mentioned: