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Brown dusty algae are usually diatoms. Diatoms "eat" silicates. Some tap water contains some silicates. A newly setup tank will have all new tap water, therefore a maximum of silicates in the tank. That encourages growth of diatoms, but before long they have cleared out much of the supply of silicates. Even 50% water changes don't replace all that has been used up. So, the shortage of food for the diatoms causes the colony to die back, eliminating much of the brown algae problem. (Until we once again replace nearly all of the water in the tank again.)

That is my opinion based on what I read about diatoms and widespread experience of many planted tank keepers.

I'm almost sure Amano Shrimp eat diatoms, based on when I tried them in my tank several years ago. My infestation of diatoms vanished in about 3 days after I added the shrimp.
 

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I'am also facing this issue in a newly setup tank. Would not enough water flow cause this problem? I am only running a sponge filter at the moment. I have three nerite snails and only running my light cycle for 8 hours. The tank has maybe been setup for 6 weeks now.
 

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Mollies and Platys are also good algae cleaners.
All of my tanks when new for at least 8 weeks suffer in some way from diatoms.
2nd stage is GSA for me, that's when I add 3 nerites per 20 gallons to keep glass and plants clean.
 
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