BBA on slow growing plants like anubias Is caused by high Nitrate levels combined with low or no co2.
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I don't disagree with this. If someone is looking for a fun way to kill a couple hours on the internet just google "causes of BBA". The theories are endless. Too much co2, not enough co2, fluctuating co2, high organics, high water flow, low water flow, bacterial imbalances, ammonia spikes, high TDS, certain light spectrums and on and on. There is anecdotal evidence for and against about all of them but very little hard science.
Could be that a combination of a couple or several factors are in play. I think it is safe to say that in general practicing consistent tank maintenance, giving desired plants the necessary nutrients, light etc. they require and maintaining consistent water chemistry will go a long way towards limiting and possibly eliminating unwanted algae of any kind. I think it's also safe to say that too much light, either intensity or duration, combined with any of the other possible contributing factors will make the situation worse.
I also thought that more light meant faster growing healthier plants. Better to compete with the algae right? After a point though it's just more that you need and it can cause more algae. Again, as a general rule, 7-8 hours of light a day is probably in the ball park. If you are running much more than that try cutting it back and see if the plants still do okay. If you get to that point and the plants are doing well but still lots of algae try dimming the light or raising it a bit higher. People mention using window screen to reduce intensity.