Cleaners routinely remove external parasites from reef residents. Once my wife and I witnessed gigantic 1,000 pound manta rays coming to the top of an undersea pinnacle to be cleaned by specialized angelfish. Cleaners tend to be fishes and shrimp with special adaptations, such as long white antenna, to advertise their presence and they usually stay in one small area. By remaining a reasonable distance away, fishwatchers can see a parade of fish waiting to be serviced. Many Caribbean cleaners are tiny, so look carefully and always from a distance.
Some juveniles look like miniature adults and a few are exact replicas with different colours.
Moray eels have gained a bad reputation over the years but actual attacks are few and always explainable. The experts credit the Caribbean with ten species of moray of which only two are widespread. The spotted and the goldentail are classed as common but the green, reticulate, purplemouth, viper, chestnut, honeycomb, chain, stout and broadbanded are a rare novelty. For example, coneys and grasbys often are found staring at eels. The fish look very attentive and focus their attention on the eel which is often very hard for the human observer to see.