use ph down and adjust to 5.5, soak for about 5 min, then dip them in your nutes, i use a 2tsp thrive alive red per gallon of ro water for clones and seeds alike. if you don't have ph down you can use a fresh lemon's juice little bit at a time, like 1/8- 1/4 tsp at a time give 30 min for ph to stabilize. hit you plants with a foliar spray that has root stimulator a day after transplant to rockwool. it helps with transplant shock, i also usually give them 10 hrs of darkness immediatly after.