Feeding Frequency with sunshine4

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How often should I feed flowering plants in Sunshine4? I just switched from hydro so to soiless and buds aren't looking quite as dense as the hydro. Still need to hook up CO2 (never used with the aero system and buds were great).

Need to find someone who can splice it into my main Propane line, or should I just keep refillilng small tanks?

At the moment I fert about once a week and top water.. have smaller ones in trays that i fill with nute solution once/wk. and let them suck it up for a couple hours before I drain to waste. I use the Humbolt premium line... any suggestions? Should i fert more often? Water before fert?

Thanks,
caregiver