If your prepping your fish for a competition in a month or two...Ching Mix, Sumo, and XO. If your just raising and growing them out - New Life Spectrum and Hikari Excel or Hikari Spirulina for Koi.
I have heard alot about NLS but never tried it personally.
And to answer you water, it does work very well for me although i am always open to looking into other ideas, so i may have to do some more checking on NLS. As far as pellets being a variety, i agree they do contain a great variety of food and nutrients which is why i include them in the diet however IMO there is no substitute that mimicks whole food items I mean thats what they have survived and thrived on in the wild for however many millions of years (for those that will correct me, yes i understand that flowerhorns are not that old, but other similar fish are), therefor I happen to believe that whole food items should be included at least to some extent. And live foods on occaision also give them that thrill of the chase, that my FH seems to absolutely love.
Once again, this is only my opinion of what works for me, and i always welcome advice/suggestions, as i realize there is ALWAYS more to learn lol.
If your prepping your fish for a competition in a month or two...Ching Mix, Sumo, and XO.


"Amino acids, several vitamins, and inorganic nutrients are relatively stable to heat, moisture, and oxidation that occur under normal processing and storage conditions. Some of the vitamins are subject to some loss, however, and should be used in excess of the requirement." (NRC Nutrient Requirements of Fish 1993)
"If high quality, stable forms of vitamins are added at concentrations sufficient to compensate for manufacturing and storage losses, and the feed is stored under cool, dry conditions, manufactured diets can be stored for several months." (Coehlo, 1996)
As far as the extrusion process causing nutrients to be destroyed........
As long as a manufacturer takes into account that a certain percentage of some vitamins will be lost during the cooking process, and formulates their vitamin supplementation with this in mind, adjusting the ratios accordingly, this is a non issue.
Think of it this way, if one poaches an egg in water, does that mean that the amino acid (protein) of that egg has no value? Of course not, cooking the egg may change the structure of those amino acids, but those amino acids are certainly still bio-available. I don't know anyone that eats raw eggs, usually due to the fact that uncooked eggs can contain various pathogens. The same applies to "cooking" fish food, it kills various pathogens and can greatly improve overall digestibility of many of the raw ingredients.
Seeing as the diet of "wild" fish are being compared to FH, while a fish may not eat pellets in the wild, they do in fact consume all of these same nutrients (amino acids, fatty acids, vitamins, minerals,etc) they are simply bundled up in a different package. For that matter, if one is going to compare the wild diet using the species of fish that make up the bulk of most FH genetics they should probably be supplemented with aquatic and terrestrial invertebrates (not bloodworms), which nutrient wise doesn't offer anything that's not already found in a quality pellet. Unless someone knows something that I don't?
I don't have a problem with those that feel the need to supplement with frozen/live food, but IMO if one chooses their pellet food wisely there is no need to do so. The reality is that a high quality pellet will offer FAR more nutrients per ounce than any foodstuff these fish would ever consume in the wild.