Tuna has been eating f/t rats for the past 6 meals. Just now I lowered a warmed up f/t rat into her tank. She crawled right up to it, started smelling it and then started focusing on the tongs I use to feed her. It's like she smells the rat and wants to eat but can't seem to focus on the head/body of it.

Then she struck at it and bit it by the foot and curled up around it. After a minute she let go of the foot and started circling her head around the rat as if trying to find the rat's head.

No clue what's going on, any thoughts on this? I changed her tank a week ago but this started happening before too.