Diatoms, algea, that kind of thing. They're supposed to be really good in for your tank. I found a few, but didn't know what they were at the time, so I chucked 'em. After reading up on them, I wish I hadn't.
I'm pretty sure they eat coraline, but consume other alga in the process. I had a couple and they didnt last to long maybe a couple months. Didnt move too much like the ad says, and not really worth taking from the wild IMO. They are pretty cool though. The tiny ones do much better survival wise.
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