I use San Francisco Bay brand Marine Cuisine that I get the local Petsmart or Petco.
https://www.sfbb.com/Marine-Cuisine™_17.php It has a good mix of stuff for all the fish and they all love it. Here is the list of what is in it Brine shrimp, mysis shrimp, krill, plankton, menhaden fish oil, brewer’s dried yeast, vitamins [choline chloride, magnesium sulfate, iron, inositol, α-tocopherol acetate (source of vitamin E), zinc sulfate, manganese sulfate, calcium carbonate, L-ascorbyl-2-polyphosphate (source of stabilized vitamin C), biotin, calcium pantothenate, niacin, sodium selenite, pyridoxine hydrochloride (source of vitamin B6), riboflavin (source of vitamin B2), potassium iodide, vitamin A supplement, citric acid (preservative), folic acid, thiamine mononitrate (source of vitamin B1), menadione sodium bisulfite complex (source of vitamin K3 activity), cobalt carbonate, vitamin B12 supplement], sodium alginate, spirulina.