Thanks for the input. First off, my thought on it is that Xenopus laevis is also a 100% aquatic obligate carnivore. They benefit from a diet of 100% worms and Rangen pellets are also a commonly recommended food, and it has been shown that many of them do better on a diet of mixed cichlid & turtle pellets than on simply worms. I'm not just looking for a cheap diet- I'm looking for the best all around diet while factoring in nutritional value, availability, and cost. Since Rangen pellets can be bought as cheap as $0.60/lb, I'm relatively sure they're the cheapest thing.
Here's some nutritional information about some of the different foods-
Rangen's "Soft-Moist Sinking Salmon Pellet"
Protein ...44
Fat.........18
Fiber.......<5
Ash.........<8
Ingredients: fish meal, wheat feed flour, blood meal, fish oil, ascorbic acid, biotin, choline chloride, folic acid, niacin, panthothenic acid (d-calcium panthothenate), pyroxidine(hydrochloride), riboflavin, thiamine (mononitrate), vitamin B12 supplement, vitamin A (acetate), vitamin D (d-activated animal sterol), vitamin E (dl-alphatocopheryl acetate), vitamin K3 (menadione sodium bisulfate complex), copper sulfate, manganese sulfate, potassium iodate, salt, zinc, sulfate, ethoxyquin (preservative), proprionic acid, sorbic acid, propylene glycol.
HBH Soft Sinking Newt & Salamander pellets
Fish meal, wheat flour, blood meal, fish oil, krill, l-ascorbic acid, phosphate (source of vitamin C), biotin, choline chloride, folic acid, niacin supplement, d-calcium pantothenate, pyridoxine hydrochloride, riboflavin supplement, astaxanthin, thiamine mononitrate, vitamin B12 supplement, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, vitamin K3 supplement, copper sulfate, manganese sulfate, potassium iodate, salt, zinc sulfate, ethoxyquin (preservative), propionic acid
Omega One Super Color Sinking Cichlid Pellets
Guaranteed Analysis
Min. Crude Protein….38%
Min. Crude Fat……….12%
Max. Crude Fiber…….2%
Max. Moisture………..8.5%
Max. Ash……………...8%
Min. Phosphorus…….(.5%)
Min. Omega 3 ………. 1%
Min. Omega 6………..(.5%)
INGREDIENTS: Whole Salmon, Halibut, Whole Shrimp, Wheat Flour, Wheat Gluten, Fresh Kelp, Krill, Lecithin, Astaxanthin, Zeaxanthin, L-Ascorbyl-2-Phosphate (Source of Vitamin C), Natural and Artificial Colors, Vitamin A Acetate, Vitamin D3 Supplement, Vitamin E Supplement, Vitamin B12 Supplement, Riboflavin, Niacin, Pantothenic Acid, Choline Chloride, Folic Acid, Biotin, Inositol, Tocopherol (Preservative), Ethoxyquin (Preservative).
Earth Worms contain-
Crude Protein-62.2%
Crude Fat-17.7%
Calcium-1.72
Types of proteins are essentially the same (fish) between the two diets- Omega One actually sounds like it has better proteins in it to me than Rangen does! Where Rangen only uses "fish meal" (meaning "leftover scraps"), Omega One actually uses whole salmon and whole shrimp. Omega One also includes fresh kelp- some plant matter. Yes, both ACFs and axolotls are obligate carnivores. Absolutely. However, even obligate carnivores consume vegetable matter. They simply get it through the prey they eat in the wild. Most people recommend gut loading worms or other live feeders before feeding them out- what are you gut loading them with? Vegetable matter. This is why the highest quality carnivore foods for most species of animals (from dogs all the way up to big cats) include some plant matter. Wheat is included in both of the diets, and I'm fairly sure that's primarily a binding agent to help form a pellet. Either way, wheat is generally a filler ingredient- very few carnivores can digest wheat. In Rangen's diet it's the #2 ingredient, with more wheat than even blood meal.
The %s are different- Rangen has a higher protein and fat percentage. But Rangen seems to me like they don't use as high of quality ingredients. Rangen also includes copper sulfates, which have been shown to have negative impact on reptiles and amphibians- most people recommend not feeding ANY copper sulfates to herps. They're shown to hinder development of amphibians. A little looking into it shows that copper sulfates are added to salmon food to help prevent algae growth on the nets & such in farms! If we're told not to add it to our axolotl tanks, why are we recommending food that contains it, especially when the only purpose of it in food is to prevent algae growth?
And as a final bit of input-
Farm raised salmon lack the nutritional value of wild caught salmon. They don't contain the same amount of vitamins, the omega fatty acids, have tons of bad things in them (preservatives, pesticides, etc. . .) and simply aren't as good for you. Why? Many people say it's because farm raised salmon are fed garbage food that is primarily waste product, compared to the healthy whole foods they eat in the wild.