If I'm going away for a while, I pre-package food for each day, make sure my top-off is full, demonstrate skimmer cup cleaning, warn them that some algea will build up on glass and tell them not to worry about it (ie: I don't want them sticking anything in the tank to try to clean). Lastly, I have them turn off the lights for the last 3-4 days and stop feeding. This makes their job easier, makes over feeding less likely and I always find that a few days of no light and no food makes the whole tank look a little happier.
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