Its a bit late now but "water" roots and "soil" roots are NOT the same. The old roots from they hydro are dying and the plant is trying to grow new roots that can use the soil. Moving from soil to water is easy because the roots can grow quickly with out much work, soil its slow and hard. Best thing to do now is give them lots of water, the plants are to big for the new short roots to get all the water up to so I would mist the leaves to help slow the water loss. Also try cutting (if your still in veg and not flowering, if your flowering your fucked and that sucks) the tips off of all/most of the fan leaves as the tips are most likely going to brown up anyways. Look up pictures of clones to see how far back to cut the leave tips, this should help ease the work for the plant and once the roots are out they should be just fine, after all it is a weed!

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