I've just seen these in my tank for the first time today, crawling on the glass and sand. I think they might be pods of some sort but I just wanna make sure.
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Perhaps it's a tanaid.
It might be a harmless Munnid Isopod or something similar, but for some reason I don't think that's correct. The links below might help though.
http://www.lionfishlair.com/hitchhikers-guide/
http://www.reefkeeping.com/issues/2004-08/rs/index.php

