It basically depends on what kind of tank you want to run and whether or not you feel confident enough in the person(s) looking after the tank while your gone.
My tank is setup so anybody can look after it it is a simple setup and all they have to is feed once a day while I am gone I don't run GFO, carbon or that other stuff just a skimmer and return pump and ATO. The more you run the that can go wrong hence the trusted person(s)
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 My aquarium is nothing but a smorgasbord for my cats.....
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