I also use gavita 1700 my ppm ranges from 600-800 in veg and 1100-1800 in flower. I water once every 2 days and flush every week. I use 3 gallon pots and water about 1500 ml every pot in motherearth coco 70/30. In veg my temp is around 81-83f and humidity 65-70. In early flower i still keep temp around 81 and humidity around 60-65. Once i hit mid flower i slowly decrease both temp and humidity while increasing ppm. About 76-78f and humidity around 50-55. Late flower i go about 72-74f with humidity 50-53. Last week of flower temp 66-68 and humidity 45-50. Hope this helps im also still learning so maybe we can learn from each other.