Weird white stuff in the substrate?

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Luananeko

Aquarium Advice Addict
Joined
May 8, 2012
Messages
1,682
Location
Beaverton, OR
I've got what almost looks like the white mold you'd see in forests scattered across a section of my substrate in my 75 gallon planted community tank... Anyone have any idea what it is?

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Is it just unsightly, or is it something harmful? The only fish acting off so far is my female GBR... Shes sitting at the top of the tank with her nose touching the surface just hovering... Not overtly sick, but definitely not as bubbly and friendly as I'm used to seeing her.

Any ideas??
 
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