Hola! es mi primera vez en DWC y lana de roca, mi plántula tiene 3 días creciendo allí y la veo un poco amarilla, mi lana de roca creo que lleva mucho tiempo húmedo, será eso? tengo otra plantula en iguales condiciones y se ve bien!
Que sugieren?
Your ph should be at 5.5 to 6.0 with 5.8 being best for veg. Your nutrients should be at 400 ppm 0.8ec if it is a photo period and 200 ppm to start if it's a auto. Increase by 100 ppm 0.2 sec every week if your seeing good growth stop at 800ppm 1.6 ec for photos and 600ppm for autos. Keep your water cool and lots of air with the levels just touching the rock wool, or just a touch below.
Test your pH, that's the first thing. Next, make sure the light is not too close, I typically put my 100W about 12" from sprouts/seedlings. Its not a deficiency yet, I can promise you that.