New to this

So this is my first ecosphere jar. I've made terrariums before but this is totally new to me and I went into this knowing it's gonna be experimental. So far I've loved watching it get less cloudy each day, but today I noticed these weird little worm looking things that have air bubbles on the top, I'm unsure of what's going on so I came here to find some answers and suggestions for what to do next. Thanks!!