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Anyone know what this orange is?

Anyone know what this orange stuff is that's showing up in my tank? It's on the frogspawn rock, and it's a few other places in the tank. I have never seen it before and it seems to be spreading.
Thanks
 

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mnat

Officer Emeritus
Staff member
Moderator
Sponge is good but I don't think that is sponge. Do you have a more zoomed in pic.
 

Mark_C

Staff member
Officer Emeritus
NJRC Member
Moderator
Tough to tell from shots, as mnat said. May just be a diatom outbreak, can appear rusty orange/brown.
 
It's tough. I'm horrible with my cell phone. This is about the best I have.
 

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