We tested the potential for aggressive mimicry by a group of coral reef fishes, the colour polymorphic Hypoplectrus hamlets, from the point of view of their most common prey, small epibenthic gobies and mysid shrimp. We build visual models based on the visual pigments and spatial resolution of the prey, the underwater light spectrum and colour reflectances of putative models and their hamlet mimics. We apply Maia & White 2018 two-step statistical approach to estimate statistical and perceptual separation based on noise-corrected colour distances. The results of the PERMANOVAs and related bootstrap procedures on dS, dL from visual modelling of Mysidium shrimp and masked goby (Coryphopterus personatus) are presented here. Our results are consistent with a proposed mimic-model relationship between the butter hamlet H. unicolor and its model the butterflyfish Chaetodon capistratus but do not support a second proposed mimic-model pair between the black hamlet H. nigricans and the dusky damselfish Stegastes adustus.