Top Fin betta pellets ingredients.
Fish meal, wheat flour, soybean meal, krill meal, corn gluten meal, stabilized fish oil, squid meal, yeast, lecithin oil, choline chloride, calcium propianate, l-ascorbyl-2-polyphosphate (C), vitamin A acetate, D-activated animal sterol (D3), riboflavin supplement (B2), vitamin B12 supplement, niacin, menadione sodium bisulfite complex (K), folic acid, thiamine (B6), d-calcium pantothenate, biotin, dl-aplha-tocopherol (E), manganese sulfate, cobalt sulfate, ferrous sulfate, copper sulfate, ethylenedamine dihydroiodidem, ethoxyquin (anti-oxidant).
Wikipedia Description for it:
Ethoxyquin is a quinoline-based antioxidant used as a food preservative and a pesticide (under commercial names such as "Stop-Scald"). It is commonly used as a preservative in pet foods to prevent the rancidification of fats. There has been some speculation that ethoxyquin in pet foods might be responsible for multiple health problems