Sand turning orange colored when lights on

cbs49er

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So my tank is about 10 months old, 20 gallon with weekly 5 gallon water changes. Lately I noticed my a section of my sand bed turning orange color when the lights come on. If I look very closely I can see very small brown grass like strands coming out which I’m guessing is aptasia? Anybody know what’s going on and how to treat?

65FDC080-50A4-448D-A109-B286541855F7.jpeg
 
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