I'm considering a Formalin dip and I have two questions I hope someone can answer. I have Formalin MS from fishvet and it calls for 20 drops per gallon. Does 20 drops equal one ml? Also, if I'm treating my QT with Cupramine can I use QT water for the dip or should I use fresh saltwater? I understand I can use PraziPro with Cupramine but I not sure about Formalin MS. I would appreciate any info you may have.