Any idea what these black spots are on my anubias?

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CarloM12

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Hello I have been seeing these black specs on my anubias leaves a lot lately. I have a 75 gallon tank with a fluval plant led light. NA Thrive about once a week with an eco complete substrate. It looks like algae but I donā€™t think it is
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They can't eat it all, especially if it is continually growing
 
Try decreasing your lighting period.
 
Try decreasing your lighting period.
Did that but Iā€™m not sure itā€™s it. I tried taking it off itā€™s very difficult almost like itā€™s part of the leaf now. What else would you do itā€™s really only on these leaves most visible to the light. Light is on 8 hours during the daytime the rest is sunset and sunrise. I also canā€™t really get my Amazon swords and other stuff to grow tall Iā€™m not sure if itā€™s too much light or what the issue is with that. They are really healthy and give off loads of leaves however they never grow taller than maybe 5-6 inches.
 

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