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It looks like iron and light are the drivers for this algae. I unfortunately have lots of experience with this. It doesn't go away for me, maybe it's my tap water or the dirt I'm using. Best I can do is control it.
So to follow up on this. I've also read that too much iron can cause this algae. I've lowered the time that the lights are on and lowered how much Fe I dose and it is seemingly gotten worse. What have you tried to control it?

I've been struggling with this algage for almost 2 months. My CO2 is pretty stable and I've made the changes I described above.
 

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First, welcome to APC!

If you have low light and no added CO2 you will be unlikely to get black brush algae. But, if you add DIY CO2, which is always variable, as opposed to stable, you will get BBA even if you do have low light. I am using 20-30 PAR lighting now, on 3 tanks, and I don't use any added CO2, so (knock on wood) I don't have any problems with BBA. When I was experimenting with DIY CO2 with the same amount of light, I had to use Excel to avoid BBA, and even that didn't always work. During this experience I was dosing per the Estimative Index method, so I had abundant iron in the water. Now I am still dosing per the Estimative Index method, but at about half the recommended amount - no BBA.
Thank you so much.
My light I would say is moderate to high, It's a Finnex Planted+ 36Inch light. I run it at full power for about 6 hours a day. I dry dose using EI method, I have pressurized CO2, the plants are growing like crazy and the tank is what I think would be considered heavily planted. I dose 3/8 tsp KN03, 1/8 tsp of KH2PO4, 1/8 tps of Trace elements, 1/2 tsp of Magnesium Sulfate and 1ml of Seachem Fe 3 times a week. On Sunday I do a 50% water change.
I just read the entire 29 page thread of Excel affect on algae, a lot of info in there. Including something I found interesting. Increasing KNO3 should help with BBA. I'm going to bump my KNO3 dose to 1/4 tsp instead of 3/8
 
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