Good luck man, you have a nice DWC set up for your first grow. Temperature is very important in DWC because cold water has more concentrated oxygen molecules and roots love that. Root rot is common if your temperature is high. But to combat it, most of us favor Hydroguard by Botanicare. Look into it. If you’re serious, you can get a cooler but it’s several hundred bucks. Ultimately, you can flip your lights on at night and keep them asleep during the hottest part of the day. Cheers.
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