Having had and have both now, i'd say Armatus. AFT tend to grow very slow, and don't leave much for the viewing pleasure sometimes. They might not even eat in front of you. The Armatus grows much quicker, and looks pretty cool when they have a fish caught in between those big fangs before meeting their faith. Though both can be skiddish, ATF tops the chart in that category hands down...And I would agree a Armatus can live in a 300 gal for quiet some time. I don't think there have been many reach 24 inches on here has there? It seem 18in seems to be the size of most peoples, and for what ever reason they start having problem..


