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As far as I know Snakeheads are banned in the U.S. I know for sure they can't be sold legally in the pet trade. You might want to check on the legalities before you try to acquire one. Just a thought
That and they are known to ram their bony heads into tank walls at high speeds to break the tank and escape, unless you want to waste that 600gal I'd go with something more entertaining and much less destructive