this week i had big trouble with water temps. its getting hot as hell in my tent. i purchased a small A/C but its cooling just 2-3 °C down. hot water temps are worse for Hydroponics. Now im cooling my water with fresh ice to push temps below 21°C every 2-3 hours at day time. For my next grow during hot summer time i will build a RDWC to keep water temps as low as possible.