Can anyone tell me whats wrong with my plant?

Ph is at 6.1.
Ppm is at 500 now
Added first dose of cal mag two days ago.
Basically my leaves are going a yellowy colour i cant work out why. Added neuts and cal mag...

Please help
 

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Why didn't you give them cal mag until recently? Your issue seems obvious if you were starving them of cal mag.
 
Uniform yellow usually is an indicator of hungry plants like the guys above are telling you ....what are you planning to feed em ....more info you give us the more we can help
 
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