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Could it be too hot?

Kinda, I was guessing at how much water I was putting in to top up the buckets but I just marked out the bucket so I can get more accurate mixing... may have been a little bit light, thought I was playing it safe.

Another pic

I have seen signs of brown spots for a few weeks now. Any ideas what this could be? Notes: - they've been in flower 2 weeks - nutes were floranova and cal/mag to 1300 ppm at .5 conversion - ro water - 1000w hps - dwc I just switched to Lucas formula today, 8/16 micro/bloom with no cal...