Is a stonefly nymph a producer 1st consumer 2nd consumer or 3rd consumer?

Stonefly nymphs are generally carnivorous. They are typically 2nd or 3rd level consumers as they enjoy eating other animals like caddis flies, mayflies, and true flies. Stonefly nymphs may eat detritus or plants when they are particularly hungry at which point they would be 1st level consumers.