you want to discontinue your Grow-type nutes a week before switching to 'Bloom' light-cycle ... nitrogen interferes with flowering, but still needs a trace, that's why Bloom nutes still have a little nitrogen in them ... I would suggest your fanleaves are yellowing from too frequent cycles, mine greened right back up, after cutting my pumps way back ... I now run DWC 'on' 15 minutes every 3 hours, shouldn't be much different for your style, my guess :jointsmile: