What should i do???

[Jessie55]

I am going to be going back home for christmas and my tank will be unattended for about a week. I have a top off unit and an auto feeder for the fish but im worried about dosing. My few lps and sofies should be fine but i have 6 sps frags that are really starting to grow and im worried about my alkaline i have to dose about 10-15ml a day to keep it around 9 kh could i potentially run into major problems????