Help needed Dwc roots have stopped growing

Hi guys I’ve been growing in rdwc for a few years now with minor issues , this time around i transplanted clones to system a few weeks back hand watered till the roots come through and started growing in the water nicely then all of a sudden the roots have pretty much got to a stand still and the leaves are showing signs of what I believe be nitrogen deficiency I may be wrong though .
the roots don’t look to bad but just not growing , I’ve upped the nitrogen in the feed but still doesn’t...

Help needed Dwc roots have stopped growing

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