I found these in my sump initially. I was pulling out some hair algae that's growing in my refugium (can't grow macro to save my life, but the gha grows plenty) and noticed some on my skimmer. Then I found one on the front glass of my refugium. Did a thorough inspection of the tank and didn't find any in there but when I looked down into my overflow they were everywhere. I peeled back the black sheet I had put over the glass around the overflow to hide the pipes and was shocked by how many are in there.
What are these things?
What are these things?