Take some tankwater out, replace with freshwater.
Don't take out too much though, I'd shoot for a 0.001 reduction per every few hours, or at least no faster than 1/2 hour. Altering the SG too quickly will stress your tank inhabitants.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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