OK, here is my 2 cents.., first, get your ph to 5.8.second, stop with the nutrients..this is still seedlings, no nutes needed. third, get temps right, maybe too hot in there, put fan on across top, but NOT affecting plant yet...just to keep cool.stop with the nutes, just keep rockwool wet with 5.8 water, that's all.nutes at seedling stage with your ph will kill this plant.
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