Gsp Receding with a black almost purple ring

Porkchop95

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So I’ve had this tank up and running for a while now everything is running good except for small algae spikes until one day I noticed there’s black spot that I’m guessing is a flat worm of some kind was moving on my back rock and I thought nothing of it until I noticed my gsp starting to pull back and has a black purple outline
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DSC reef

Coral wasted
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Looks like it could be dying off. Does that pectina coral throw sweepers that could be touching the GSP?
 
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Porkchop95

Porkchop95

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Looks like it could be dying off. Does that pectina coral throw sweepers that could be touching the GSP?

I’ve watched it at night and the few sweepers that do come out are far above the gsp thanks to my water current ... any ideas how to save it ?
 

*K&AreeFers*

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I have had the same thing happen in my tank. But to be honest I wish it would knock back more of it. GSP will take over your tank if your not careful.
 
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