Hurry gotta get this in before RD. recites the Fish Keeping Bible verses of Nutritional Foods.

This coming from someone that used to brag about feeding Vienna sausages to his fish.
I've kept both, and both did exceptionally well on 1mm NLS. (which already is a complete & varied diet)
FYI - Bio-Gold is more nutritionally complete than Gold, and the price difference between the two reflects that.
Whatever you decide to feed, keep the pellet size small, these fish are hard wired to sift & eat food of smaller particle size. (certainly not Massivore sized pellets)