Please do not mix medications and make sure the prior medication has been diluted before new dosages administered (stick to one treatment). Copper is available in sulfate, chelated, and Cupramine. PraziPro is Praziquantel and does not kill ich. As for freshwater dips, I've literally used this method on hundreds of fish and have never lost a single one to it, but seemingly limited to the hosts epidermal layer (I often employ prior to release). Most copper time frames are from 10-14 days and will kill most external parasites except Brooklynella. Hyposalinity usually requires 14-30 days (ich has been known to survive past the lower thresh hold of hypo), but does not kill Brooklynella or Amyloodinium and can exhibit proper conditions for Uronema. Regardless of the method you choose, don't mix the meds (some meds such as Formalin/Malachite green and antibacterials such as Furans can be used in conjunction).