As long as you continue to be in the tank on a schedule to change water, spot feed, and handle them they learn to not associate your hands with food. My big ol' female will never strike at me when I do any of that, but when I dangle a rat in she makes quick work of it.
Yeah I thought the same thing, and look what happened lol.
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"The greatness of a nation and its moral progress can be judged by the way its animals are treated." - Gandhi