I am not one to ask about feeding regime, I only feed my fish once a day. It makes for slow growers but I feel it decreases bloat chances and makes for cleaner water. Some people feed much more then this. Do as you will, just feed a good quality pellet. I like to vary with crickets and worms. Occasionally throw a zucchini in there. But mainly I use NLS.
From 1-3 inches they where not shy at all. Very personable. However right when they hit that 3-4 inch mark and started getting alittle rough on each other, they got much more shy. Before I rejoined my single umbee survivor to my office aquarium he became a mix of shy and outgoing. While I wasn’t at the tank he was right up from looking and glaring at his reflection. However when I walked up he would zoom away to hide. This is good, it means their intelligent and is a mechanism for staying alive in the wild.
From what I understand they come out of their shell around the 10inch mark.