Originally Posted by Callen
@ mebbid: how low should the salinity be for a hyposalinity treatment? How long do they stay in? How does that compare to a freshwater dip?
the Specific gravity should be from 1.009 to 1.010. You will need a refractometer to measure this accurately enough. They stay in hyposalinity for 2 weeks after their last sign of ich. As opposed to a fresh water dip, it is much much less stressful on the fish and will eradicate all traces of ich rather than being a temporary remedy for a serious outbreak. When my tank first got ich it was soo bad I was worried my clowns were going to die (my firefish was immune *shrug*) They looked better almost immediately after they recovered from the stress of the fresh water dip but that doesn't get rid of all of the parasites by a long shot.
It's approximately 1/2 the amount of salt you normally use to get the right concentration. It's also a pita to keep the pH consistent when doing hyposalinity. I ended up using the water I pulled out of my DT which I dilluted by 1/2 to do water changes in my hyposalinity tank. Not sure if that's recommended but it worked great for me and saved quite a bit of salt..