Hello. You will need to reintroduce oxygen to the water/mix for the plants roots. Water left sitting for 24 hours will have about 95% of the oxygen dissipate out. Put a air bubbler in the water for 30 minutes before watering. If the water container is not full all the way then shake it up to get all to oxygen back into the water. I use a electric hand mixer or a bar mixer. It needs to be strong and you need to bend the blade into a propeller that pushes water away. It adds oxygen and mixes at the same time, and it just takes a minute or two to saturate to water with oxygen. Chuck.