Help identify this hitchhiker

[BlueR6]

A week ago I found one of these tiny guys on the glass of my 55gl reef tank. Now I've found at least ten more. Any idea what it is and

if it's safe?
Thank for your help


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[Sugar Magnolia]

Harmless Elysia.

 

[SeaCucumberFan]

I dont wanna say I agree...


But I agree