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As mentioned, if they're not happy where you put them they'll move to where they are happy. Mine roamed once across my entire tank width. I tried piling rocks in it's path, HAH!!! Just be sure to watch whatever you decide to put in your tank so you can move anything you don't want stung or eaten
Good start.So create an island with moderate waterflow by the rock and set it on there and the BTA will be happy?

