What's this little guy ?

I recently bought a few live plants and put them in my quarantine tank. I have Java Moss, Duck Weed, and Anacharis Elodea. I've been monitoring the tank for little hitchhikers. I just saw this little guy swimming around. So far he's the only one I can see. No snails yet. 🤞 Since this is my first time properly trying to introduce plants into my tank, (first time was a hot mess. Didn't know I was supposed to quarantine) if this is a bad guy, what's the next step ?