if well fed, they are simply much more likely to leave smaller tankmates alone. The dental work of eels tells you a bit about eel diets. Sharp toothed eels like tesselata, dragon, green, etc are largely piscivores but will eat just about anything. Pebble toothed eels like golden, zebra, snowflake etc are largely crutacean predators and will likely eat small benthic fish as well. They are also generally smaller and better tempered than their sharp toothed cousins. So keep a zebra well fed and it "shouldn't" eat your smaller tankmates... individual by indivdual basis. Don't stock with anything you would be crushed to lose.
all eels are escape artists and NEED a lid with no holes larger than half their own body width (arbitrary ratio but probably safe). no exceptions. what site said that zebras are less likely to escape?
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