Last year I went on vacation for two weeks. I had my sister in law top off my tank with Ro water and wrote a formula for additives that has worked for me. I also asked three friends for support in case Sister in Law had any problems. I got permission from friends first of course. I wrote down the times that were convient for person at which time of day. I knew what shift person worked from talking to them. I highly recommend building a support system for your tank. Now is the time to do this if you have not. You never know if you will be trapped at a air port or etc. Please plan a head. If you do not do this, How will your tank maintain itself peacefully with out any issues?