Well it had to happen. I don’t think many tanks make it past the first couple of months without and outbreak of diatoms – AKA Brown Algae. This bacterial growth covers rocks, substrate and most anything really with a brown dusty slime. You can see in the photo that the rock that was only one week ago pretty light and clean is now growing brown diatoms.
Usually this stuff goes away after the tank settles down a bit more – if it persists too long I will see if there is anything more dubious going on.
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