The new betta I got, which I have posted numerous things about, decided he wanted to play and explore. I was thinking he might want to play with a bead. I'm wondering what size and what type of bead. I was thinking a large pony bead maybe? What's the biggest thing a betta can swallow? It's form 3-7 mm in diameter. Can I use that bead? He's also interested in a transparent yellow/orange rod I've been moving around the water. He seems to be happier when music is on. Why so? I know they wouldn't like death metal though.