First time dwc grow

Hi good people looking for some info if my situation is normal this is my first hydro/dwc grow. I have a white widow from ams in rockwool 20ltr bucket. Temps light on 24-25 degrees light off 16-18.0 water temps flux between 17-20 ppm is 730 as of an hour ago ph 6.4 but flux a little bit.. I had the start of root rot about a week ago but got it in time and got rid of it plant bounced back awsome and adding new leaves daily. Plants 14days in dwc. So after reading on here I think maybe ppm too high but it's half of what the neuts recommend. Anyway my question is the plant seems to be eating up the neuts but not really drinking water is this normal?? Thanks in advance.
 
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