Crown-of-Thorns starfish (CoTS) are a pervasive coral predator prone to population outbreaks that have damaged coral reefs across Australia and the wider Indo-Pacific. Predation pressure has been suggested as a mechanism that suppresses CoTS outbreaks at a local scale. However, CoTS predator-prey interactions are poorly resolved, especially for early life history stages. Here, we provide results from the first comprehensive investigation of potential CoTS predators for the rubble-dwelling juvenile phase. We assessed the capacity of >100 common rubble species found across Heron Reef to consume CoTS juveniles from 1-12 months old. For confirmed predators, we explored how predation behaviour and associated CoTS mortality varied across CoTS densities, size classes, gradients of habitat complexity and the presence of alternative prey options. We identified only a select few species that regularly preyed on CoTS, with most predator species frequently exhibiting partial predation (e.g. severing bodies and arms), not total consumption. We highlight one novel predator, Schizophrys aspera, the red decorator crab, that consistently consumed CoTS juveniles across trials, including in preference over alternative prey. This work broadens our understanding of factors that control the build-up of CoTS at the critical juvenile stage before they are detectable as an outbreak population.