Is the mucus dome stuff clear and kind of jelly like?? I have a 6 line and every once in a while I find some jelly type stuff floating around the tank. I got some right now clinging to some rock in the back of the tank that I can't reach unless I take the rock out... I didn't know what/where it might be coming from until I read your post...
I got picked up a shrimp a while back but my 6 line attacked it so no shrimp for now.
Yup, it's clear. It's a mucus tube they make to protect themselves while sleeping. There is no need to remove it. Take a flashlight once the lights are off in the tank and search around for the 6 line. You'll see his sleeping bag if you can find him. That must have been a tiny shrimp and a super mean 6 line. I've never had one attack a shrimp...