How often do you guys replace the hoses on your regulators and SPG? Do you wait until it leaks or change preemptively? My hoses are starting to bulge a little by where the hoses come out of both of the first stages. They have about 500 dives on them. I have spare hoses lying around which I will swap out at some point, but it got me wondering what everyone else's experience has been. Also, how long do the hoses last if they are stored in a cool dark place (i.e. Pelican case in my closet)? Do I need to worry about the spare hoses rotting or losing structural integrity if stored and not used? The spare hoses came from a scuba setup I made for my wife a while ago, but she no longer dives. Thanks.