Would a Snakehead be able to live with another fish in an aquarium?

It really depends on the species. There are many smaller species that top out around 6"-8". Even with their aggression, some larger tougher fish can probably hold out assuming the tank is large enough.
 
Given suitable tanks Snakeheads are generally fine with fish they can't swallow whole except at breeding time, but that goes for alot of fish.Suitable for a Channa barca might be 55 gal, whereas suitable for a C. micropeltes would be a small swimming pool.
 
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When I first started with fish, I had a small snakehead (4 or 5"). This was 25 years ago or more (yes, I'm that old !!) I also had a wolf fish in the tank. The snakehead will eat ANYTHING and everything. Smaller, bigger, doesn't matter. It ate the wolf fish and the wolf fish was a good 2" bigger. There is a reason they are not allowed in the U.S.
Good luck with the bet.
 
I had a 1 foot red snakehead in with 2 oscars in a 55 back in the 90's and never had a problem. That was before they were illegal and before it jumped out of the tank while I was on vacation.
 
I kept a few different species of snakeheads back in the 80's. Snakeheads will kill anything they can not eat.
 
Community choices
With such a highly carnivorous nature you may also believe that snakeheads are not suitable for the community tank but, if heeding a few warnings, some make good community fish.

Consider first the size of species and many dwarf species behave well enough to become community fish. Another concern is the size of tank mates. Obviously, maintaining a school of Neon tetras with snakeheads is too much of a risk, so they should always be kept with fishes too large to be considered food.

For many medium-sized snakeheads in the 30-40cm/12-16” range, tank mates should ideally be relatively fast swimming and robust fish. Many medium-sized to large cyprinids are therefore ideal.

Despite their predatory nature, smaller snakeheads are retiring in nature, so can suffer at the hands of large, aggressive cichlids.
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There you go
 
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