Unidentified Swirls


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Hey guys,

I am new to aquarium tanks as my brother was the big fish guy. He had a former saltwater 80g tank with live rock that he eventually changed to fresh before he left. My dad who is a big pond guy put some small join in it and I recently restocked it with some tropical. My nitrates got real high and my pleco and betta died. So I went to do a water change and was cleaning some rocks when I found these on the under side. Not sure if they're a source of concern. Any help would be appreciated.
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