Chrysaora quinquecirrha (Sea nettles) is prey of:
Other suspension feeders
Mya arenaria
Crassostrea virginica
Polychaeta
Nereis
meiofauna
Callinectes sapidus
Alosa pseudoharengus
Alosa chrysochloris
Anchoa mitchilli
Brevoortia tyrannus
Alosa sapidissima
Micropogonius undulatus
Trinectes maculatus
Morone americana
Arius felis
Pomatomus saltatrix

Based on studies in:
USA: Maryland, Chesapeake Bay (Estuarine)

This list may not be complete but is based on published studies.