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The black algae in the 3rd photo is definitely BBA. You have to keep the CO2 concentration in the tank water the same every day during the photoperiod, you have to provide everything the plants need to grow in good health, and you need to avoid organic waste in the tank and water to avoid that type of algae. The more light you have the harder it is to do all of those things well enough. So, reducing the light intensity makes avoiding this algae easier.
 
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