The nutritional value of carbohydrates varies among fish. Warm-water fish can use much greater amounts of dietary carbohydrate than cold-water and marine fish. No dietary requirement for carbohydrates has been demonstrated in fish; however, if carbohydrates are not provided in the diet, other compounds, such as protein and lipids, are catabolized for energy and for the synthesis of various biologically important compounds usually derived from carbohydrates. Thus, it is important to provide the appropriate concentration of carbohydrate in the diet of the fish species being cultured.
The problem with the vast majority of Flowerhorn "specialty" foods, is that they are a gimmick - designed to create the illusion that if one feeds it to their flowerhorn, it too will grow a massive nuchal hump just like the fish that's illustrated on the package.
When in reality, genetics will determine the potential of your fish, not some slick willy marketing propaganda.
If used in proper inclusive rates (as in not massive amounts) flowerhorns can easily assimilate & utilize both wheat and soy.
From the NRC's Nutrient Requirements of Fish, which is pretty much the bible for every commercial fish food manufacturer. Not the be all to end all, but a great reference source to work off of for tropical species.
Also, 12" ash content isn't overly alarming, it would depend on the source of those inorganic minerals, along with the ratio of the other raw ingredients. Adding a ton of starch to a food can result in a food with very low ash content, but that doesn't necessarily equate to it being of higher quality compared to a food with a higher ash content. (and far less starch)
There seems to be a lot of confusion regarding the crude protein percentage found on fish food labels, and hopefully I can help clear this matter up for anyone that doesn't understand how these numbers come about.
Percentages on labels are for the most part nothing more than numbers that someone wearing a white lab coat have come up with via an in-house analysis. As an example, typically the crude protein % is nothing more than the total nitrogen content found in the food. That doesn't tell you anything about the amino acid content, the overall quality of that protein, or even the total digestibility of that protein. (as in the protein that your fish can actually assimilate) An old leather boot would appear as "crude protein" on a pet food label.
In other words it is impossible to judge the quality of one food over another by simply comparing percentages found on a label.
Most consumers are easily bamboozled by slick marketing and smoke & mirrors used by some manufacturers on their labels. Including some of those that list whole halibut, whole salmon, whole shrimp, etc, when in reality most of the fish used in their foods is processing plant leftovers. (waste) Of course by the time that you get to the wheat flour and wheat gluten portion of the label, it appears as though the food is mostly comprised from fresh "whole fish", when in fact if one combined both wheat products together as one, theoretically there could be more wheat, than fish in the food, and short of some serious lab work no one would ever be the wiser.
Personally I avoid any pet food that is made in Asia, as those manufacturers are almost never held to the same standards as the manufacturers that make pet food products in North America. Melamine anyone?
P.S. - $3.00 for 20 grams of food is a major rip.