WHAT COULD BE WRONG!

HI am using hydro for first time, (autoflowers) was told hydro far better than soil for yield, am using an nft system and have them in reflective room under 400w orange hps light 19/5 have them in there bigger cubes, since i took them out the propagater they havent really done anything what could be wrong please help?? I used ph water 5.5 in pre soaking and in resevoir, i was concerned they didnt develop there roots, so used root booster 4 days ago. i lifted the lid and they all have roots, any ideas would be very grateful, i thought they would accelerate when then deveolop roots in bigger cubes??

The image shows a plant ready for your NFT system. If your plants are not at this stage DO NOT transplant. It is always better to delay transplanting until correct root stage is reached in order to achieve best results in the end.

The reason for this is that if white roots aren't abundant on the outside of the propagation block at transplanting to NFT the block will absorb a large volume of solution. The roots inside the block will be saturated but with no access to oxygen. As a result they will die-back and successful introduction to NFT will not be possible.

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