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.
also, why such large rockwool, these should be in 1 inch cubes, then into the next larger size, but what us your medium after??
is the light really 2400w???
get that rockwool wet asap, with just ph 5.8 water.
these are gunna be mothers. I need approx 80 clones every 60 to 70 days. they are from Amsterdam seeds co. fenimized
Good luck with the grow ;)