Do you grow your veggies in DWC? Just pick up some soil and do it like veggies. I grow hydro because I have lab sciences in my education and I can't keep a regular plant alive just cannabis and orchids. Although last year with
@shnkrmn literally living at my beck and call to try and help I did get 6 tomatoes but it was a herculean effort for me LOL
Go to soil or at least a soilless substrate like ProMix and your life will be so much easier. I started growing in rails and I moved to a soilless substrate (still hydro but with a little longer time buffer) in DWC and rails you have little buffer. Nutrient changes are instantaneous and you need to have a chemistry bent. So just go with the flow and pretend they are tomatoes