They seem to grow super fast up to 14-18 inches (about 1-2 inches a month), then they slow to half to a quarter that rate. I think it takes 3-4 years for them to reach around 3 feet, full size is around 3-4 feet.
They are totally peaceful, make awesome monster fish companions for aros and rays too I hope!
I have one left for $700 if anyone is interested...Heck of a deal, especially with the Australian dollar now being almost at par with the Canadian dollar. At $700 the fish is basically sold at cost. Even better deal, combine with one CV Maju SR coming in a couple weeks.
Meanwhile, a few photos of what these guys look like when big: