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Hey everyone!
I have a pretty heavily planted 20 gallon aquarium with Eco-Complete, a 100watt 5000ish k CFL light, and DIY Co2. I thought Brown Algae formed in low light, but as you cn see, I do not have low light. BTW this algae is not stringy or clumpy it is like a brown/light brown paste/coating on the aquarium glass. Why is this happening and how can I stop it?
THANKS!
 

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Diatoms most likely. Part of new tank syndrome (if it is a new tank) and usually dissipates after all the silicates have been removed (1-2 months). But hard to tell with out any pictures or how long you have had the tank.
 
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