I use a python for my weekly water changes so I use water straight from the tap to refill. To avoid using any water that has gone through my water softener I use only cold water. If I am not careful on my refill I can shock the fish. My question is am I being over cautious not mixing with the hot water that has been through my water softener. Does anyone out there use softened water in their water changes and if so does it affect your tank parameters in any way. Thanks for any help.