It sounds like your American green tree frogs are exhibiting some common dominance behavior. As Larry mentioned, this is quite normal among many frog species when they're determining hierarchy. Keep an eye on their health and behavior, especially their eating patterns and physical condition. If you notice any significant changes, like one frog becoming thinner or showing signs of stress, it might be time to consider separating them. It's great that you're observing their interactions closely – that's key to ensuring they both stay healthy and happy in their environment.
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