Best low maintenance fish for office tank: excluding goldfish?

Depends on tank size! All commonly sold fish can go a weekend without food anyway, as long as someone is keeping up with weekly partial water changes and the tank is properly filtered/heated/cycled etc.

So what size tank is this office tank? Bettas for instance need filtered, heated, cycled tanks 5 gallons plus, while someone else mentioned an Oscar, that needs over 75 gallons.
 
yeah, an oscar. my pops had one for years and no matter what i did i could not accidentally kill it. once when i was cleaning the tank i was trying to grab it to put it in a smaller bowl and it ran into the side of the aquarium and knocked itself out. it was just kind of floating around in the water, but an hour later it was fine again. i hated that fish.
 
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