Blackish blue spots

EricDRubin

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Location
Rutherford, NJ
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2 years
I've always had diatom issues though snails have helped out (at first they cleaned the entire tank in 2 days...Now they are lazy and letting it come back lol). But now I have something I've never seen before. My plant leaves have these dark blue/black spots. Photo attached. Anyone know what it is? Is it bad? What should I do?
My lights start sunrise at 11:30am and hits peak light at 1pm. Sunset starts at 7:30pm and turns to blue night light from 830 to 10pm. Total darkness 10pm to 1130am again. I don't think this is excessive light periods. I need light for the plants so I cannot go total blackout.

Thanks!
 

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