1 of the coolest monster fish i ever owned was a juvenile tiger musky. that fish is in my opinion one of the greatest predatory fish to watch. when i dropped some feeders into the tank it would slowly creep up on them and then attack at a very quick speed.
probably a payara for me; i heard they are hard to keep though...i don't know anyone who actually keep these.
thinkin of goin back to south america and go fish for them.
Well the coolest fish i've seen is the Northen Snakehead, With it's lond dorsal fin, Small head, Sharp teeth and the fact that it can grow up to 40" and weigh up to 15 pounds yes it's one of my favorates.
But the coolest fish i own must be my Arowana ! with it's long slender body long dorsal fin larg mouth and the way it cuts through the water ! pure genius!
Then it would be my Asian redtail catfish although it spends most of the day hiding in caves but when it comes out it makes up for it!