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Lol I just looked at the picture and made my educated guess without reading what anyone else had said. I see that you mentioned the chiton now, good call. You also ended up saying it was most likely an isopod in the end of the same post
Yeah, i only said isopod because it had a hard exterior, and chitons don't normally crawl around on the glass. I'm pretty sure they have a really hard time moving around on sand, as well as glass. So i just assumed it was something that COULD crawl around on the glass, such as an isopod. But i guess i stand corrected.