For the goldie - fresh (or frozen) veggies - peas, string beans, zukes, etc are all good.
Fresh bunch plants (anacharis etc) are also good.
for the others - I'd add in a variety of frozen foods - daphnia, bloodworms, spirulina-enriched brine shrimp, etc.
Also mix up your flake food brands - sometimes one brands foods all contain similar ingredients no matter which "formula" you use, so its good to mix in other brands and formulas.
I like the Super Color, Veggie, and Kelp flakes from Omega One, as well as the Formula One and Forumla Two foods from Ocean Nutrition, and the Veggie flakes from HBH - all of those are pretty different from most common "tropical flakes" in composition, and make a nice dietary change.
I like freeze dried foods as vitamin delivery systems - I put a few worms or shrimp in a dixie cup and add a squirt of Boyd's Vitachem. Usually the dry food soaks up the vitamins in a few minutes, and when I feed the food to the fish they slurp down their vitamins
