When I kept buttis they went from 2" to 12" in about a year, and surpassed that soon after. They can be very active if given space, and in nature follow hippos eating their dung. They are quite voracious feeders, and in a 75 would require lots of water changes, with heavy filtration to stay healthy.
Not saying it couldn't be done, but would be the equivalent to keeping a Great Dane in a closet.
Not saying it couldn't be done, but would be the equivalent to keeping a Great Dane in a closet.