I'm not sure I'd say Hikari is mediocre quality. It's good quality food, it's just not so spectacular that it should merit all of the hype that it is given. The price is a bit high for what it really is, and that agitates me. Most brands when you compare them are about the same in quality, yet the prices are all over the map.
Omega One is the only brand that uses any solid ingredients which might merit a price increase of sorts. But that doesn't necessarily mean that the fish benefit any from the use of "whole" rather than meal. Either way, I'm using them from now on just on principle alone! ha! hehe
If you compare the Hikari basic tropical flakes:
Fish meal, milt meal, starch, claim meal, Antartic krill meal, wheat flour, gluten meal, cocoa powder, spirulina, carotenoid fortifier, brewers' dried yeast, sea weed meal, crab meal, fish oil, vegetable lecithin, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, menadione sodium bisulfite complex (source of vitamin K), thiamine mononitrate, riboflavin, niacin, calcium pantothenate, pyridoxine hydrochloride, vitamin B12 supplement, biotin, choline chloride, folic acid, inositol
With the el cheapo Wardley premium basic flakes:
Ingredients
Fish meal, wheat flour, soy protein concentrate, wheat gluten meal, herring meal, brewers dried yeast, fish oil, rice flour, shrimp meal, wheat germ meal, soy protein isolate, spirulina, krill digest, crab meal, ferrous oxide, lecithin, xanthan gum, L-ascorbyl-2-polyphosphate, choline chloride, betaine, astaxanthin oil, oleoresin carrot oil, chlorophyll extract, ethoxyquin, vitamin A, vitamin D3, vitamin E, riboflavin, niacin, calcium pantothenate, menadione sodium bisulfite complex, folic acid
There appears to be little difference in the quality of the food. Not all of the ingredients are identical, but they are so similar that it hardly merits Hikari charging almost twice as much money.