Assume your roommate needs things spelled out like a four year old would. Anticipate how things might go wrong and write out solutions... for example what if your skimmer overflows, what should he do? What if the return pump jams, what should he be looking at to make sure things are working. So many of the little "checks" we do in our tanks are so second nature we don't even think to look at them so make sure you write them out in good order.
Have backups that he can easily use, like a backup return pump, backup heater, etc. Have instructions on how to swap them out. Tell him which store has good ro water if your RO unit craps out. Call a friend who is local and knows about the tank, see if that friend would mind being an emergency contact number.
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