Don’t know, but my fish just love them.
The tangs, the Anthais, the clowns, all go nuts.
Combined with a variety of different frozen items, both meaty and plant based is good nutrition IMM.
From a purely nutritional standpoint, I believe pellets may have the best bang for you buck.
Kinda the the dog/cat kibble thing, kibble has the most protein /fat content, but most love the “wet stuff”.