one of my bunnies ears flopped down 2 days ago. he is maybe 5 or 6 weeks old. i bought him cheap at some place so i don’t think he has lop genes. he isn’t tilting his head at all, but occasionally scratches at his ear and shakes his head. he is eating, drinking, and pooping normally. i looked in his ear and it’s not red or anything. should i be worried or buy him something for an ear infection?