I found this parasite in my tank this week. It was the second time I saw it but the first time I lost him before I could catch it. He wasn't on any fish or plant, he was on a wood piece the first time and the second time (when I catch it) it was on a rock.
I only saw one but with the plants, rocks and wood there might be more.
I wonder what is it (google image wasn't really helpfull) and if there is anything I need to do to protect my other tank habitant (shrimps and neon tetra)?