Just dose 4 days worth of the Tropica ferts before you leave for overseas (its meant to be dosed weekly anyways, just that users prefer to dose smaller amounts daily).
No need to dim the lights since your lights and Co2 injection are on timer schedule, so its already automated.
Feed the fishes slightly more the day before too, they will be okay without regular food for a few days (can consider it like simulating wild conditions where food is naturally scarce). Fishes are also able to last quite a while without feedings if your tank has a good population of tiny critters... especially tasty shrimplets.

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