Keep in mind that hydro is the only growing experience I have and have been very successful with it. All it takes is daily monitoring of ph levels and nutrient/water levels. Keep the ph good and you will have a nice crop. I don't even have a ppm meter. I change nutes weekly and keep ph at or around 6. I take that back... I change nutes weekly after seedling stage is over cuz your plants won't suck up too much nutrient solution at first. Any more help.. feel free to contact me.