There are auto-feeders you can buy that disperse a regulated amount of food at a given interval.
The big problem is keeping the tank clean. It can take time to clean the tank and changing the water or filter can get messy at times. Not something most would typically do on company time. But it does depend on the company. Lots of companies here in Hong Kong/China have fish tanks because of Fung Shui and superstition, so taking care of the fish is a company function.
While there are some different animals and plants you can get to help keep the tank clean, you end up having to go through and clean the fish poop out still.
That said it can be rewarding and provides a nice regular break for those times you are swamped and super stressed. Or piece of mind if you're superstitious.
Source: I took care of my friend's girlfriend's fish because she didn't.
