HELP BETTA BABY HAS CLEAR TENDRIL COMING OUT OF IT

Hello So this morning I was checking on my baby bettas that I bred myself and one had a long and CLEAR tendril coming out of it. The tendril isn’t moving so I assumed it is not a worm/parasite. It’s similar to a fish bone almost. I will attach a picture, it is hard to photograph it but you can see right under the tiny guy there is a long line of something. It seems to be doing fine otherwise came to eat food and keeps moving around. I really would appreciate any identification for this thing.

poop, but it shouldn't be clear. The fish might have an upset tummy. Monitor it and if it is eating well and doesn't do more stringy clear or white poop, it is fine.