Found this:
<span style="font-family: Arial"><span style="font-size: 13px">I've not posted the general instructions for a hyposalinity treatment before now. Mostly it isn't that difficult to perform. However, there are some pitfalls and for some aquarists (especially those that think</em> it will be easy) it isn't easy. http://www.reefsanctuary.com/forums/images/smilies/biggrin.gif" alt="" /> Hyposalinity is the nicest (to the fish) and easiest (on the fish) way to treat marine fish of Marine Ich ([I]Cryptocaryon irritans</em>).
The hyposalinity treatment only treats a very limited number of ciliated parasites. The most notable in this group is Marine Ich ([I]Cryptocaryon irritans</em>). The home aquarist will <u>not</u> be using hyposalinity to treat any other disease or condition. Is this clear? I'll write it again -- hyposalinity cures ONLY Marine Ich.
A hyposalinity treatment will kill: Pods, snails, crabs, invertebrates, corals, live rock, most marine algae, and Marine Ich. This is why it is best performed in a separate, bare bottom, hospital tank. It has been performed successfully in fish only aquariums where there is no live rock and the substrate doesn't have worms and pods in it. But the best treatment tank is a bare bottom hospital tank, set up like a quarantine tank.
A hyposalinity treatment will not kill other parasites or conditions. A hyposalinity treatment <u>does not kill</u> Marine Velvet ([I]Amyloodinium ocellatum</em>), bacterial infections, injuries, intestinal parasites, external parasites, and a few hundred other diseases. Let's get to it! </span></span>