I know this thread hasn't had any activity for a long time, but I wanted to just add my two cents. We had an individual move out of the Orlando area and he needed to do something with his Duss. Since it had been in a 300 gallon aquarium, I offered for him to donate it to our school's 300 gallon. He was doing fine, but he was too big for that size aquarium. Within 4 months, we ended up donating him to SeaWorld.
If your tank isn't larger than a 300 gallon, do not get a Dussumieri! He will outgrow the tank.