I don't feed mine any particular food - they eat what the other fish eat (flake, crisps, frozen bloodwords, brine shrimp, cucumber etc. - what ever floats down to the bottom of the tank), though occasionally I'll feed them sinking pellets or algae pellets (if the silver dollars don't get them first :roll: )
I see all 6 of my khulies at feeding time which is anytime between 5pm and 8pm