autoflower help

I am running a 35gal r dwc i have two totes with two six inch net pots in each 1 a 600 watt hps. With a 475 gal per hour pump 1 1/2 pipe ran though out i planted green house kalashnikova auto.I put then in 4in rockwool they sprouted in two days is that fast .two week later still no roots out of the bottom the room is set at 75 water temp at 72 started dynagro veg kln and protek at 1/2 strength they. Look green and healthy when should the root shoot out of the bottom

If the roots are directly in oxygenated water then 2 weeks is not too long. Give them another 3-5 days. I use an oxycloner and I see almost no roots for 2 weeks then BAM! big thick roots. Just wait.