Walmart carries very low grade products such as Wardleys or Tetra, I would either order a quality pellet such as New Life Spectrum from Amazon or make the trip to Petsmart and pick up some Omega One pellets. The ingredient list in Wardleys or Tetra is very typical low end food which uses alot of grains such as corn, wheat, and oat flour which serves as low grade proteins, fillers, and binding agents. Look at their list and then compare to NLS which uses actual whole Antarctic krill and whole hearing instead of fish meal which utilizes all the left over parts from other industries rather than the whole fish. The type and origin of proteins will have a drastic effect in digestion and overall fish health.
NLS:
Whole Antarctic Krill Meal, Whole Herring Meal, Wheat Flour, Whole Squid Meal, Mussel Meal, Algae Meal, Garlic, Soybean Isolate, Beta Carotene, Spirulina, Vegetable and Fruit Extract (Spinach, Broccoli, Red Pepper, Zucchini, Tomato, Pea, Red and Green Cabbage, Apple, Apricot, Mango, Kiwi, Papaya, Peach, Pear), Ginseng, Vitamin A Acetate D-Activated Animal Sterol (D3), Vitamin B 12 supplement , Thiamine, Biotin, DL-Alphatocophero (E), Riboflavin Supplement , Niacin, Folic Acid, Calcium Pantothenate, Pyridoxine Hydrochloride, L-Ascorby-2-polyphosphate (Stable C), Choline Chloride Ethylenediamine Dihydroiodide, Cobalt Sulfate , Copper Proteinate, Manganese Sulfate, Ferrous Sulfate.
Tetra:
fish meal, dried yeast, ground brown rice, shrimp meal, wheat gluten, feeding oat meal, fish oil, potato protein, dehulled soybean meal, soybean oil, algae meal, sorbitol, lecithin, monobasic calsium phosphate, ascorbic acid (source of vit. C), yeast extract, inositol, niacin, L-ascorbyl-2-poolyphosphate, riboflavin-5-phosphate (source of vit. B2), A-tocopherol-acetate (source of vit. E), D-calcium pantothenate, thiamin mononitrate (source of vit. B1), pyridoxine hydrochloride (source of vit. B6), vitamin A palmitate (source of vit. A), menadione sodium bisulfite complex (source of vit. K), biotin, cyanocobalamin (source of vit.B12), cholecalciferol (source of vit. D3), manganese sulfate monohydrate, zinc sulfate monohydrate, ferrous sulfate monohydrate, cobalt nitrate hexahydrate.
Now simply compare the first 5 ingredients, then continue on comparing line by line and you'll see a clear winner.
With regards to the Hikari wafers they really don't contain much in regards to algae so they are more than fine for any fish to eat them without harm.
