shrimp is a good food choice as long as it is handled properly (I wouldn't use leftover bait shrimp, or human food shrimp that have been left too long at room temp (unsafe for us is unsafe for them IMO)). But shrimp from the deli are a great food for big predators IMO.
I used to feed shrimp to my breeding oscars when I was in college - wayyy cheaper than krill ! and great for bringing out the red colors.
I also fed alot of live marine crabs, shrimp, and silversides (I lived 2 miles from the beach in Florida, and collected my own food every weekend ). Gut loaded crickets (I feed good quality flake food to the crickets) and redworms were also very happily slurped down, as was the occasional small "fence lizard" (aka anole).
My current oscar gets assorted "Formula" frozen food cubes from Ocean Nutrition, frozen shrimp, crickets, worms, and pieces of scallop in addition to pellets (and the occasional flake or wafer he grabs when I feed his tankmates), not to mentions frozen mysids, plankton, and bloodworms.
I try to avoid pet store feeder fish for any of my fishes, but I do feed this oscar the occasional cull from my breeding tanks.
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