This guy is super tiny saw him on my glass this afternoon. Has a rounded body with two antennas on his head.
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Looks like a Elysia slug. Safe. They eat filamentous algae and Caulerpa.
You're welcomeAwesome Thank you!
I have several as well... I found their ID here:
https://www.nano-reef.com/forums/topic/375777-tiny-orange-nudibranch/
Vayssierrea felis