Brown algae and bubbles suddenly all over my tank

GP0801

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I'm pretty new to the aquarium thing but everything seemed to be going so well the past few months and all of a sudden today the tank and equipment is covered in this brown stuff and bubbles. There were even patches of sand flying around because the bubbles were carrying them through the water. What is this stuff? I'm a little worried that it's harmful to my livestock. I took a picture of the tank yesterday morning and it was completely clear although I was starting to see a bit of this stuff popping up yesterday. I included a picture from yesterday as well.

Thanks in advance.

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Aquarium Specialty - dry goods & marine livestock
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GP0801

GP0801

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Yeah definitely not pleasant to look at but my number one concern was my fish and corals, I wanted to make sure it wasn't anything harmful. I didn't know diatoms could spread so quickly I thought it might have been something else. Thanks for the reassurance everyone.
 

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