I dosed my tank with coppersafe around a week ago. Dosage is good for a month according to box. My question is, Do I forget water changes for a month????? This is a crowded tank, and bioload is big, so I usually change anywhere from 25% to 40% every week or every other week. But I would assume that changing out water will reduce my meds in tank. Dose again??? No water change for a month??? What???? Help! Thanks!