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If you have high light intensity and too little CO2 in the water to support the plants growing in response to that high light intensity, you usually end up with BBA. Or, if you have plenty of CO2, but don't have enough water circulation in the tank to keep CO2 (and fertilizer) enriched water available to all places in the tank, BBA is usually the result. Once you get it only small infestations will go away by correcting the CO2 and circulation problems. With serious infestations you have to remove or kill what is already there or it just grows better with CO2.
 

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I find that once BBA starts on a plant you need to kill it with Excel or a bleach water mixture. It doesn't often just go away on its own. I'm sure the growth rate would be much less at lower light, but I don't think it would just vanish.
 

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I have had bba in both my original low light tank and my high light tank. for me the real solution came not from over dosing excel or bleach treating. Instead I first started by cutting my light period from 12hr to 4hr then I did water changes daily of 25% or more for a least a week. This started reducing the amount of bba in both tanks. What finally did the trick was reading all about aquatic fertilizing. I found that the cause of the algae was an imbalance of nutrients and light and the DIY co2 was not very consistent, adding to the problem. So now with a good fert routine my plant aere growing fast and the algae is almost gone on its own. This is just my experience so far and I hope you have success in your bba battle.
 

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so it's black and an algae, and if i bought some plants that say, had a touch of bba i might have a problem? Gerry
You could prevent that from being a problem by dipping the plants in a strong Excel/water solution for a few minutes. Any BBA will turn white when it is dead, after first turning red as it is dying. Then if the tank conditions are right, no more should grow.
 
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