Hi there just wanted to ask what it is that I see on the back of my greenbottle blue tarantula. And it's not the shimmer of its colours. It's located on the section that joins the carapace and the abdomen. Looks like a shiny ball ? But of clear water ?!? I'm not stupid and I hope it's not bleeding as this looks similar. But it's perfectly round and shiny when I put light on it. Anyone have any ideas. It's an adult that's all I know.