im using 5 galon bucket bubblers with top drip. What is a good nutrient combination and how high ppm should I get per 5 gallon with out the use of CO2.

depends on what stage they are at, Im growing DWC right now and im currently in week 8 of flowering using about 1200 ppm at this point, but you want to start out low at first then push it up. I started at about 200 for the first 2 weeks then pushed it to 800 ppm at about week 3

I did the same without the top drip, under hid I set mine at 1300 ppm @7 and keep it there through the whole grow unless you want to flush towards the end, also use the gh micro and bloom, look up lucas formula that is what I use nothing but good results so far

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