I don't know about you guys but I cut a variety of materials, I was using steel slats and converted to Galvanized material.  Even with the conversion the supports for the slats, which I have yet to change are Steel.  I think the next time I change them, since they last awhile, I will use stainless on those.  Even so I am getting alot of orange staining from the rust in the past!  My tank is coated with an epoxy paint so its holding up but for long term I was curious about some type of anode.  I do a lot of RV camping and they use them in the water heater tank as well as inside of some gates for damming water to keep it from rusting up.  I was wondering if anyone used them in their tanks.  Any thoughts?