clones rooted amazing but after transplant into coco no growth from roots or plant

i picked up 20 very healthy clones from a clone shop near by and the roots coming out of them were amazing. after transplanting into 3 gal coco perlite mix its been a full week and the roots have not grown one bit. the plants are doing nothing but slowly yellowing.
i just finished 3 crops with the exact same nutrient setup and ha no issues like this what so ever cant figure it out!