If you're doing this in your 10 gallon be careful. A water change probably would be in order. Moving the CC will put detritus in solution. You just can't help it. Could cause a spike. If it was me I'd remove fish, corals and rock and place is a safe tub. Pull all the CC out, rinse well. Add sand, add 1/2 saved water, 1/2 new water, put my animals and rock back in and still watch numbers. Keep a cup of your old CC and put it in the bottom of your tank. There's lots of life in there that will help seed your new sand.
Good luck!