im fixing to treat my fish and leave my tank empty for 9 weeks to let ich die off. found out you can't use dechlorinator with cupramine and I've always just used conditioned tap water. so i ordered a max water 6 stage ro di unit. what i need to know is can i go ahead and start my prazi pro treatment like i was planning and do my 50% water change after im done with that treatment and put ro Di water in then and be safe to start my cupramine treatment? is replacing 50% of the water with rodi water enough to be safe and be able to add the cupramine?