for a 65 gallon i would steer clear of both id and paroon sharks, both are very active swimmers that get huge (id: grows up to four feet, paroon: grows up to 9 feet) depending on the dimensions of the tank, a 65 gallon would last them maybe a few months at the very most.
there are only a few species of sharks able to live in pure freshwater for an extended period of time, these being the bull shark which gets far to big to be kept by the average hobbiest, and the true river sharks of the glyphis genus, which not only get too large to be kept in the vast majority of home aquaria but are also extremely rare and criticlly endangered. Glyphis are so rare only a few dozen specimens have ever been found.
as for a sharklike fish that you could keep in your 65 gallon, in my opinion your best bet would be a cetopsis catfish, also known as a blue shark catfish, a blue whale catfish, or a blue dolphin catfish. they are very active, dont get too large, and are very aggressive eaters