LOL... Honestly, I normally avoid actually recommending foods, just because I've seen so many food arguments over the years, but occasionally I make an exception and I guess I let myself in for this one, though it wasn't my intention... So take the following as just a personal opinion based on my personal experience and reading.
Foods I prefer: Omega One and NLS. Also found HBH soft spirulina or soft krill pellets to be pretty good, but quit using them when I noticed propylene glycol on their ingredients list (used in anti-freeze, brake fluild, etc.
), although I've seen the same products list glycerin instead of propylene glycol, glycerin being pretty benign as far as I know-- either substance would probably be there as the ingredient that keeps the pellets soft and moist.
While not my preference based on ingredients, I've honestly found Tetra Color to do pretty well for fish color and I know a couple of respected breeders/importers who use it. Overrated imo are several types of Hikari pellets. In my testing I saw a definite improvement in color over Hikari with both Omega One and NLS, though there are a couple of Hikari pellets (Massivore and Carnivore) that I haven't tried and can't say much about. Never tried Dainichi (some people swear by it) so can't say much about it, except that their ingredients list doesn't excite me.
Then there are some really inferior foods ime, Wardley for example.
I'm a big one for checking the ingredients list. Don't like to see too many starches or grains on the list and don't really like to see soy on the list. RE:
fish food "anti-nutrient" factors in soybean meal:
Lilleeng used soya meal as the source of his ingredients, which is known to contain a series of anti-nutrients and to disturb the intestinal function of salmon. Lilleeng showed that intestinal immune defences become activated immediately (when) feeding with soya commences. He also showed that enzymes normally associated with protein digestion have abnormally high levels of activity in the intestines of salmon with enteritis as a result of soya feeding.
"Entertitis" mentioned in the excerpt above refers to intestinal inflammation. Over the past several years, I've read several articles regarding problems with soy as an ingredient in fish feed. Another example
Here.
(Got into a discussion with a NLS distributor over soy a while back and he said NLS used a more expensive form of soy protein isolate that removed the anti-nutritional factors from soy... then, interestingly, NLS recently took soy out of their formula.)