I feed him FD krill and frozen market shrimp mostly. I will say that since Ive had my payara (only eats live) is when I noticed the growth spurt, so I can only figure that the live feedings are what is making him grow faster.
JD_MAN, find me an armatus and he is all yours!!! I do have sad news, the jar jumped today. I have a spot in my tank that is no more then 3" and 3/4" wide and he managed to jump through. Im so freaking bummed and to top it all off this morning was the first day he was eating pellets!!!!