Absolutely. Sea Monkeys or Brineshrimp (Artemia sp.) can be fed to most fish. Tetras, barbs, danios and virtually every other fish out there will eat them whenever they are offered. In fact one of the best foods for rearing young fish is baby Sea Monkeys, commonly known as nauplii. Brineshrimp nauplii are highly nutritious and if fed regularly to young fish will increase their growth rates substantially. The nauplii can also be fed to bigger fishes and act a bit like plankton. The bigger fish have to swim around and snap up all the tiny little shrimp and it takes more time than simply grabbing a few mouthfuls of adult Sea Monkey.