What is your salinity at now??
If it is around the 1.021 mark I would take out about 10 gallons of water out of your tank and and using an old 10 gal you have sitting around (I"m sure you do) do a drip of fresh water into your tank. When you wake up tomorrow it should be around the 1.015 mark. Repeat the procedure and go to work when you come home it should be at the mark where you need to keep an eye on it.
I would take the Rock out as how alive is the rock going to be with a salinity of 1.008 which might cause a mini cycle stressing your fish out worse.
Medication: To effectively kill marine ich you will need medication that will kill ALL single celled organisms hence you should take your live rock out of that tank.
So really whether you use Hyposalinity or medication you are not effectively battling ich till late tomorrow anyways.
Call me at work tomorrow if you want Tony.
Best of luck
Kevin
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