Looking good!
I use NLS Thera A and mix in Northfin, Xtreme, Kensfish and Yourfishstuff foods. The flakes lately have been YourFishStuff. People get into semi-religious battles over food. Just so it's decent quality, I'm not overfeeding and supplementing with live worms, everything seems to work. Color enhancement comes from adding asthaxanthin (sp) and spirulina, which one can add independently (although a lot of foods already have some).
The Pungu have extremely specialized diets in nature but mine are hogs in captivity. Some seem to put on weight and others are always skinny. The skinny ones have regular poop (not stringy white) so I think it's the way they are.
Xtreme makes a jumbo (monster) pellet that I've used to condition and fatten them up.
Matt