Hashyanswered grow question 3 years ago Sometimes after a nute change they can be a bit stubborn, and take a day or so to start drinking again, I think that's because the temperatureof the water is different between old res and new res. I would have left the Ec at 1.8 if they was happy with that. If they don't start drinking soon then maybe make a res with a plant kleening product to wash your roots then make a fresh batch of nutes.