Larrynews, when you say a water change your saying, pull out the water from tank and replace with new salt water correct.. I do 20 gallons every 2 weeks, as to adding water for evaporation i use 3 gallons a day.
Walltank. your auto fill, you say it takes water out of your tank and replaces it with.... fresh ro/di, or fresh ro/di saltwater??? curious