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I've helped some LFS clear their retail tanks (with rock/sand) of velvet using CP and this is how we did it: Start off by dosing 10 mg/L (40 mg/gal) and then subsequently dose 1 mg/L (4 mg/gal) every day thereafter. Daily redosing is ideal, but if that conflicts with your schedule then redosing 3 mg/L or 12 mg/gal every 3 days (for example) should still be adequate. CP has a wide therapeutic range (20-80 mg/gal), so the objective is to keep it within that concentration at all times. Keep redosing for 30 days.
The reason you have to keep redosing CP is because the amount of bacteria found in a typical DT environment will degrade the medication.
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