What nutrient line you using? Does it say its specifically for rdwc or just hydro? Either way you use less nutes as rdwc (1/4 strength to begin) is more efficient. Bare in mind some hydro nutes sink to the bottom and clog pipes and resovoirs meaning regular cleaning needed especially when you see it caked up and dried at the bottom of the res. Thats why the nutes for rdwc are lighter and dont clog as much. I hated having a big res because i would have to climb in and scrub off the old nutes. Imo 2 smaller resovoirs are easier to maintain. Either way you want to change water every week to stop any nasties growing.
Get something like hydroguard to add beneficial bacteria that stops root rot which will be the main issue in hydro. Otherwise hydrogen peroxide works well if you need to sterilise the system but it also kills off good bacteria which you want to keep.
And because hydro yields massive nugs you can easily get bud rot like i did, meaning you need to use a dehumidifier if your RH is close to 60%ish end of flower, try and keep it 50% or less last 2 weeks.
Most importantly good luck