A. falcatus, 10-12", so you want a minimum tank width of 18" for adults, Seem to prefer small groups. Often hard to get to take pellets but will take mealworms, crickets, eathworms, etc. if you can't get feeders or don't use them. Not aggessive with fish to big to eat. Like to lurk under foliage. Very fast strike when feeding. I won't rate them on your scale because my tastes might be different then yours, but I think they are very cool