You didn't mention LR, do you have it? Isn't it easier to put the fish in a hospital tank than to remove everything from the tank? Do you have a DSB?
Ed, she's using pinpoint to test salinity...which, as you know, I'm not exactly happy with at the moment. In fact, I'm likely going to return it this weekend.
The specific gravity is lowered to 1.009, I'm assuming that that is what you meant, right? You must, must, must leave the fish in the hyposaline treatment for at least 3 weeks AFTER all signs of the parasite have disappeared from your fish. Frankly, I’d leave them for 4 wks…. Following this, you gradually increase the specific gravity to within normal parameters over the course of 4-5 days.
I can’t imagine how you removed your sand wo stressing the gills off your fish! If you are going to leave your fish in the tank for the procedure, then I’d leave the sand in tank. Hyposalinity will no adversely effect the nitrifying/denitrifying bacteria of your sandbed, but, if you have a DSB, then those organisms [worms, mirco crustaceans, etc.] will likely be adversely effected by the treatment.
Since you removed all of the coral, etc., what was left in the tank besides the fish?