Problem with watering

Hey guys,

I m looking for your help for the second time. The girls in the pictures start to have sad leaves very fast after feeding them, as if they would love to be fed again. But when we check the pots, they are very heavy, as if there is still plenty of food for them. One of these days we checked a girls roots and its colour was a weird yellow, not white as it should normally be.

What is to be done? To give them less food? To feed them only with water with PH, but without nutrients? Please, let us know your opinion :(
 

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