Can fish make friends with other species of fish in a fish tank?

Fish
lindsay g asked:


We have a koi and a chinese hifin shark. They look like they could be from the same family but they aren’t. But they never leave each other’s side. And when the shark was sick, the koi sat by it’s side the entire time and even helped to push him to the surface to get food. They nuzzle and cuddle each other all the time.. it’s really cute. but i was wondering if anyone else knows about this kind of behavior in fish, or if they have experienced it in their own tanks.

Nathaniel
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