I have these things all over the back wall of my Evo 13.5. They seem to be eating the algae and leave tiny little trails. They don’t seem to be in my LR or corals either but there are quite a few now.
The image is zoomed in quite a bit. They’re maybe .5mm long and move around like a slug. Compared to images of flatworms, I don’t think that’s what they are. Any ideas?