I watered my plant just before lights out, they went 2 days without water. Lights went on 6 hours later, after a couple hours the were reaching for the sky!! The next morning they are all drooping, I only gave them 1500 ml of water, I did switch to tap water but I let it sit 48 hour before using it, I check the PH and it was fine, what could cause this!! The soil is MG moisture control and the plants are almost ready to go into flowering. 1500 ml is about 6 cups for those in the U.S, They are in 3 gallon containers! I was using bottle water before!