Over feeding??

Star Dawg I have in a 3 gal felt smart pot, been running peter’s excel cal-mag at 500-600 ppm, 6.8 Ph, Temps 77-80, Humidity 50-60, Constant flowing 8inch exhaust and 70 pint Dehumidifier going, been running this same mix for months, just noticed this starting to happen a couple days ago, any ideas?
 

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