2010 GMC1500 5.3l vortec. Trying to figure out this noise. It never really goes away. I kind of gets quieter when I've driven a little but but I still notice it. Definitely worse in Idle. I run a electronic AFM disabller but I just got the truck and it has 180k km on it.
Today I was looking at my cherry shrimp tank and I noticed these all over the glass. They move like little worms. I haven't added anything recently apart from an almond leaf when I went out of town for a week. Otherwise they eat hikari shrimp cuisine. All my shrimp have been in there for months and came out of another tank that doesn't have these in it. I also added a leaf into my other tanks at the same time and they don't have any traces of these.