Out of curiosity how long have you had him and what size did. You get him if you remember? And same for the one that passed unfortunately, time you had him and initial size?I had 2 Aimara. The bigger died around 1.5' the other is about 14". Neither were very fast growers.
Seems it's all dependent on where they sit in the tanks pecking order as to how well they eat. The 14"er is currently with ATF so they eat first, but competition of the Mbigua seems to help push him to be next in line.
On another note, I agree with kno4te lol.