Lets say im about 14-16 days into flowering, but now im starting to get build ups and having issues with the soil, can i flush it? its a 2gal pot so i would use 4gal of 7.0ph water correct? But will this stress the plant during the flowering, cause im having issues and i believe my soil has become hot even tho i do the 20% run off every watering
Just give it water for a week or so. It's hard to say if you need a flush, but when you get in this situation, just stop feeding.