Little critters on glass

Scary Lobster

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Rhode Island
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Was cleaning my glass just now when I saw these little guys on my glass. I'm about 4 months into the hobby so anything new is scary haha. Could I get an ID, whether they are good or bad, and if I just let them chill on the glass or scrape/blow them off? Thank you so much everyone!

20251221_152240.jpg 20251221_154143.jpg
 
Munnid isopods
 
Thank you for the quick reply and ID! I'll do some research on them, happy holidays!
Theyre great to have. Fish will eat them and they'll help keep the tank clean
 

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