Plant discoloration and septoria?

So I believe this plant to have septoria I have sprayed it down with a Fungicide and since then I've noticed that it's changed to this color I'm using sinsi grow a+b and it seems to be doing okay other than the color change so what is going on with my plant and can I still use the buds off of it if it has septoria new to growing they are on 750 watts 18& 6
 

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