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BBA is black brush algae, the black (actually red) algae that can utterly destroy your plants, usually showing up when the level of carbon dioxide in the water isn't stable. It has been noted to cause many planted aquarium hobbyists to switch to stamp collecting.
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.
 

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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.
How much Fe or micro are you dosing? Try cutting by half.
Also maintenance of scrubbing, pruning, dosing H2O2 on the algae are needed.

I've also noticed the more CO2 you dose, the more you get too. I'm dosing 20ppm, If I dose more I see that I need to trim affected leaves more. This is dependent on how much light you have I guess.

Also how much plants do you have? Basically, you want the plant to out compete the algae leaving no nutrients for the algae.
 
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