Tonight was the first time my juvenile ball python turned down a meal. This was the second mouse I was feeding him. He ate his first one no problem but this time it was different. He was tongue flicking all over it but wouldn't strike. I dipped the mouse head on warm water and my snake looked like he was drinking the water. He followed it around the tank but wouldn't take it. Humidity is at 50 and ambient temp is almost 80. I'm still working on the temperature though. Is this normal when switching food? Thanks in advance.