Blue Dream in DWC

I put 2 seeds in Rockwools, but one was taking longer and I tried to look it inside and I ended up killing it.

The seed that I didn't screw up started to grow, and when I could see the first root, I put the seed in the bucket!

After a week in the bucket, the ppm it's 310, and there is still water touching the roots/Rockwool. I read in another Growdiary someone was changing the water and putting more nutrients every 10 days, so I will wait for a day or 2 before changing it. I think I need to keep around 400-450ppm, and I don't want to put too much. I turned on a small fan, open the tent a little for some air circulation, and turned on a humidifier. The solution's temperature yesterday was 24.4C (75.9F), the internal temperature is was around 25C (78F), and the humidity around 51%. The PH was 6.