You can weekly dose your Mg, Ca, N and K but for P and the Micros you should dose a bit more frequent. I would say maybe every 2, max 3 days for the micros and depending on what level you want to dose P you can dose every 3, 4 days. How long are you going away for? For example if you are going away for 3 days: Dose minimum 12ppm N, 12ppm K, 3ppm P the night before you leave after lights off and dose 0.4ppm Fe on the day you leave. I personally keep my tank at 40N, 3P, 40K, 0.1-0.2Fe so I would do a %50 water change one night before and dose 20N, 20K, 3-4P, and 0.4Fe in the morning. This dose would go for 3 to 4 days after then the tank would need a micro dose and maybe some P.
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