I've never looked so closely on the walls of my aquariums, but I found white specks on both of my betta tanks, sorority and divided. There is a lot of algae in the sorority, but the divided has none, and it still has the My fish are still active, eating, and are acting normal, but I'm worried of what this could be. I'm not sure if it has always been like this but I just noticed yesterday. They're the size of a spot of ick, all different types too. I used a macro lens to take these pictures.
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