Noticed some seedlings center vein has a defined yellow. Any thoughts? 1/2 are NL (5 days old) and 1/2 Blue King (2 days old). I gave all 300ppm water yesterday and they seem to have responded well. First one is DWC. The rest are in FFLW under 600 watt MH @ 40" and a ton of circulation. Temp 81 Humidity 50.
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