Autoflower with spots

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hey guys, I have a autoflower that is 5weeks old and has these spots on it. Plant is growing good but these spots will not stop. This has been going on for 4 weeks at least. I am feeding the plant general hydroponics 3 part system with calmag. 1/2tsp micro, 1/2tsp grow, 1tsp bloom and 1/2tsp calmag per gallon. This puts my PPM around 450 to 480ish. Oh and I am using a 5gallon DWC system. When checking my PPM and PH daily I notice my PPM is dropping so I am guessing I can bump that up, but also notice that the PH climbs quick. I change my water yesterday and the ph was 5.5, checked it today about 16hrs later and the ph was at 6.1 attached are some pictures of the plant
 

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